An ECU 1 includes a circuit board 10, a connector 20 fixed to the circuit board 10, a resin portion 50 covering the circuit board 10 and the connector 20. A buffer portion 60 is interposed between the circuit board 10 and the connector 20, between the circuit board 10 and the resin portion 50, or between the connector 20 and the resin portion 50. This configuration enables the buffer portion 60 having elasticity to absorb the stresses generated due to differences in linear expansion coefficient in the boundary portion between the circuit board 10 and the connector 20, the boundary portion between the circuit board 10 and the resin portion 50, and the boundary portion between the connector 20 and the resin portion 50. This makes it possible to prevent the connector 20 from peeling from the circuit board 10.

A ratting prevention structure is provided. Further, an electronic component module, an electrical connection box, and a wire harness which adopt the ratting prevention structure are provided. The electronic component module includes a cover having a rectangular opening portion, a connector block inserted into the opening portion of the cover, and an engagement mechanism engaging the block member with the opening portion of the cover. The rattling prevention structure is used to prevent rattling between the cover and the block member. In the rattling prevention structure, four pressing protrusions are formed at any one of four corner parts of the cover and four corner portions of the block member at the opening portion. The four pressing protrusions are configured to bend four walls of the cover inward while displacing the four corner parts of the cover outward.

An engagement structure includes a cover having an opening portion, a block member inserted into the opening portion, an engagement mechanism configured to engage the block member with the opening portion, and an engagement stabilization mechanism configured to stabilize an engagement state of the engagement mechanism. The engagement stabilization mechanism includes a first stabilization mechanism and a second stabilization mechanism. The first stabilization mechanism permits excessive insertion due to backlash that occurs in the engagement mechanism and to restore the excessive insertion after the block member is engaged with the opening portion. The second stabilization mechanism performs a slide engagement between the block member and the opening portion and to restrict a wall inner surface of the cover from moving away from an outer surface of a side portion of the block member after the slide engagement is completed.

A portable electronic device includes a stylus including a pen-shaped casing structure, a support structure, a rear circuit board, a function assembly, a pen head structure and a power supply. The support structure is disposed in the casing structure. The rear circuit board is positioned on the support structure. The function assembly is disposed on the support structure. The head structure is partially disposed out of the casing structure. The power supply is electrically connected to the rear circuit board. The function assembly includes first, second and third conductive members, first and second movable members, and a button body. When the button body is pressed to drive the first and second movable members to move simultaneously, the first movable member simultaneously electrically contacts the first and second conductive members, so the first and the second conductive members are electrically connected with each other through the first movable member.

An electronic unit is provided. The electronic unit includes a circuit board provided with an electronic component and a terminal, a terminal holder fixed to the circuit board and holding the terminal, a first casing assembled so as to abut on the terminal holder, and a second casing assembled to the first casing so as to sandwich the terminal holder between the first casing and the second casing, and configured to maintain a state where the terminal holder and the first casing abut on each other by being engaged with the first casing so as to restrict movement of the first casing away from the terminal holder and by elastically pressing the terminal holder against the first casing through a pressing piece extending from the second casing.

An electronic device includes: a casing; and an electronic circuit board housed within the casing. The electronic device further includes a protector which is provided on a surface of the electronic circuit board that faces the casing. The height of the protector is larger than the height of an electronic component mounted on the surface of the electronic circuit board that faces the casing. In a state that the electronic circuit board is housed within the casing, the protector abuts on a surface of the casing that faces the electronic circuit board.

The present invention provides an electronic control device including: a housing which has an opening portion formed at one side thereof; printed circuit boards which are inserted into the housing; and a connector unit which includes connector pins coupled to the printed circuit boards and closes the opening portion of the housing, in which the printed circuit boards include a first printed circuit board, and a second printed circuit board which is connected to one side of the first printed circuit board through a substrate connecting portion and provided below the first printed circuit board, the connector unit includes a first connector pin connected to the first printed circuit board and a second connector pin connected to the second printed circuit board, and an outer connector cover of the connector unit is disposed to be directed upward.

A case structure includes: a case having an opening at one end side; a cover configured to close the opening; and a pressing and holding portion configured to press and hold a board against the case when the cover applies a force to the board in a state where the board is accommodated in the case and the cover is closed.

A submergence detection device includes: a housing in which an opening is formed; and a detection electrode disposed inside the housing and configured to detect a submergence. A through hole is formed in the housing. When seen from the opening, a wall surface that is located in the housing farther than a position of the through hole is watertight. When seen from the opening, the detection electrode is disposed closer to the opening than the through hole.

A housing for accommodating a single or multi-part printed circuit board includes an opening in a first housing side for inserting the printed circuit board, at least one guide rail having a groove for receiving the printed circuit board and being situated on at least one first housing side wall of a group of housing side walls running perpendicularly to the first housing side. The guide rail is configured to receive a peg disposed on one of the printed circuit board parts. The guide rail runs from the first housing side towards a second housing side opposite the first housing side, so that the end of the guide rail near the first housing side is further away than the other end of the guide rail from the housing side wall which is oriented perpendicularly to the first housing side wall and is closest to the guide rail.