A bracket for a vehicle mount device includes an attachment member for a vehicle side, and a holding portion for the vehicle mount device. The holding portion includes a receiving portion for receiving at least a part of the vehicle mount device by a sliding operation of the vehicle mount device, and a guide portion for a projecting portion of the vehicle mount device along a sliding direction of the sliding operation. The receiving portion includes a position setting wall for the side of the vehicle mount device, and a holding piece for one side of the vehicle mount device. The guide portion includes an elastic piece, which is elastically deformed by contacting the projecting portion during a sliding movement and returns to an original posture at an end of the sliding movement to engage the projection.