The present invention comprises: a slope (22) which has a main plate (34) that changes position between a low position and a high position； and a control unit (100) which controls the changing of the position of the slope (22). The control unit (100) has: a first mounting detection means (110) which detects a state of being mounted or a state of not being mounted by a wheelchair (26) with regard to the main plate (34)； a second mounting detection means (120) which detects a state of being mounted or a state of not being mounted by a wheelchair (26) with regard to a ground side plate (38)； a third mounting detection means (130) which detects a state of being mounted or a state of not being mounted by a wheelchair (26) with regard to a vehicle side plate (36)； and a ground detection means (140) which detects whether the end of the ground side plate (38) at the rear side with respect to a vehicle is in contact with a ground surface (20).Se proporciona un método para el montaje de la carrocería del vehículo (10). Primero, un piso (13) y un panel lateral (16) están posicionados en la dirección de la altura del mismo. A continuación, el piso (13) y el panel lateral (16) se presionan en un grado que no deforma el piso (13) y el piso (13) y el panel lateral (16) están posicionados. Un techo (18) se fija posteriormente en la sección superior del panel lateral (16) y la sección frontal y la sección trasera del panel lateral (16) y la sección frontal y la sección trasera del techo (18) están posicionados.
