A mold device includes a frame that is a vertical wall having a first surface that is a vertical surface to which a holding mechanism is mounted and supported only by the first surface. A fixed mold base supporting a fixed mold, one surface thereof fixed to the first surface of the frame, and a mobile mold base supporting a mobile mold, the mobile mold base held by the holding mechanism so that the mobile mold base moves closer to and away from the fixed mold base. The holding mechanism includes a rail fixed to the first surface, and a guide fit on the rail in such a way that the guide moves on the rail while the guide is fixed to the mobile mold base. The mobile mold base is supported by the holding means without using a tie bar, and cantilevered on the first surface via the holding mechanism.

A flex plate for a guiding device of an injection molding machine includes a body extending between a front surface, a back surface, a top surface, and a bottom surface. A plurality of through holes extend between the top surface and the bottom surface for aligning the flex plate with a foot of the guiding device, and a plurality of guide shoe holes formed in the bottom surface of the flex plate couple the flex plate to a guide shoe of the guiding device. A front plate couples the front surface of the flex plate to the foot of the guiding device, and a plurality of slots define a central portion of the flex plate. The central portion of the flex plate is elastically deformable about a torsional axis and can pivot relative to the guide shoe and foot of the guiding device.

A mold-clamping machine includes a pressure receiving mount, a turn table mounted on the pressure receiving mount so as to be freely turnable, a movable mount placed at a position higher than the turn table, tie bars attached to and extending downwardly from the movable mount, and which pass completely through the pressure receiving mount and a traction mount. The mold-clamping machine clamps a metal mold by moving down the traction mount with reference to the pressure receiving mount. Each of the tie bars is freely movable up and down by each of first to third cylindrical guides provided at the pressure receiving mount. The second cylindrical guide and the third cylindrical guide each include a rectangular flange portion fastened to the pressure receiving mount, and respective attachment attitudes of the second cylindrical guide and the third cylindrical guide are adjustable.