Bracket for in-vehicle device and holding device for in-vehicle device

A bracket for holding an in-vehicle device inside a window glass includes a base configured to be fixed to an inside surface of the window glass; right and left side portions protruding downward from the base; a locking member assembled so as to be movable between a first position and a second position; and at least one support portion configured to receive a supported portion provided in the in-vehicle device and inserted between the right and left side portions from a lateral direction while the locking member is located at the first position. When the locking member is moved to the second position while the supported portion is received by the support portion, the locking member is pressed against the supported portion so that the in-vehicle device is held in any of the front to rear direction and the up to down direction without rattling.