Provided is an in-vehicle electronic apparatus including a main body that includes a panel attaching/detaching part, and a panel that is attached to and detached from the panel attaching/detaching part. The panel attaching/detaching part is provided with a lock mechanism and a holding lever, the lock mechanism being arranged to lock the panel to the main body, the holding lever being rotatable and being arranged to hold the panel when the holding lever is rotated to a holding position. The panel is moved in a predetermined direction with respect to the main body such that locking of the panel to the main body by the lock mechanism is released. When the panel is moved in the predetermined direction such that the locking is released, the holding lever is rotated to the holding position due to inertia such that the panel is held by the holding lever.