A radiant heater to be installed in a cabin of a vehicle is provided. The radiant heater includes: a heater element in a flat plate shape; a first outermost layer (radiant sheet) provided on a first surface side of the heater element, the first surface side being a side facing the cabin; and a second outermost layer (heat insulation layer) provided on a second surface side of the heater element, the second surface side being opposite to the first surface side. A thermal resistance of the second outermost layer (heat insulation layer) is greater than a thermal resistance of the first outermost layer (radiant sheet).

A heater device includes a heat generating part that generates heat by energization, and a detection unit. The detection unit detects whether or not a distance between an object around the heat generating part and the heat generating part is equal to or less than a first detection distance with a first detection sensitivity, and whether or not the distance between the object around the heat generating part and the heat generating part is equal to or less than a second detection distance shorter than the first detection distance with a second detection sensitivity that is less sensitive than the first detection sensitivity.

A heater device includes a heat generating portion formed so as to be adjacent to one surface of an insulating substrate and configured to generate heat, and a heat equalizing portion arranged between adjacent heat generating portions and configured to diffuse the heat of the heat generating portion. The heat generating portion has a linear shape, and at least one of a distance between one of the adjacent heat generating portions and the heat equalizing portion and a distance between the other of the adjacent heat generating portions and the heat equalizing portion is equal to or less than a line width of the heat generating portion. In the heat equalizing portion, a distance between one end of one of the adjacent heat generating portions and the other end of the other of the adjacent heat generating portions is longer than the line width of the heat generating portion.

A vehicle heating device includes a heater, a case, and a lid. The heater uses radiant heat for heating. The case includes an end wall that faces a back surface of the heater and a peripheral wall. The lid is arranged in a location that faces a front surface of the heater. The case and the lid are arranged so that an air layer extends between them. The end wall includes a porous member and a plate. The porous member contacts the back surface of the heater. The plate is formed by a molded resin product contacting a surface of porous member opposite the heater.

A heater device includes a heater surface facing one side in a predetermined direction. The heater device includes a transmission electrode and a reception electrode arranged on the other side in the predetermined direction with respect to the heater surface, and an insulation coating layer that covers the transmission electrode and the reception electrode on the one side in the predetermined direction. The transmission electrode and the reception electrode are electrically connected to a contact detection unit, to detect contact or proximity of an object to the heater surface by a change in a capacitance therebetween. The insulation coating layer has a first component part made of an insulating member, and a second component part having a smaller relative permittivity than that of the first component part. The second component part is located between at least one of the transmission electrode or the reception electrode and the heater surface.