An article transport vehicle configured to transport an article, comprising: a vehicle body frame; a wheel supported in such a manner as to be rotatable relative to the vehicle body frame; a wheel drive source configured to drive the wheel; a placement body including a placement surface on which the article is placeable; and a transfer drive mechanism configured to drive the placement body to transfer the article, wherein the transfer drive mechanism includes: a transfer drive source; and a transmission mechanism configured to transmit driving force from the transfer drive source to the placement body, wherein the transmission mechanism includes: an output member coupled to an output shaft of the transfer drive source; and a driven member configured to be driven by the output member, wherein the placement body moves in conjunction with the driven member, wherein the driven member is not coupled to the output member and is configured to operate by being pressed by the output member, wherein the wheel drive source, the transfer drive source, and the output member are supported by the vehicle body frame, characterized in that the article transport vehicle further comprises a vehicle body cover, the placement body and the driven member are supported by the vehicle body cover, and the vehicle body cover covers the wheel drive source and the transfer drive source and is detachably attached to the vehicle body frame. a vehicle body frame; a wheel supported in such a manner as to be rotatable relative to the vehicle body frame; a wheel drive source configured to drive the wheel; a placement body including a placement surface on which the article is placeable; and a transfer drive mechanism configured to drive the placement body to transfer the article, wherein the transfer drive mechanism includes: a transfer drive source; and a transmission mechanism configured to transmit driving force from the transfer drive source to the placement body, wherein the transmission mechanism includes: an output member coupled to an output shaft of the transfer drive source; and a driven member configured to be driven by the output member, wherein the placement body moves in conjunction with the driven member, wherein the driven member is not coupled to the output member and is configured to operate by being pressed by the output member, wherein the wheel drive source, the transfer drive source, and the output member are supported by the vehicle body frame, characterized in that the article transport vehicle further comprises a vehicle body cover, the placement body and the driven member are supported by the vehicle body cover, and the vehicle body cover covers the wheel drive source and the transfer drive source and is detachably attached to the vehicle body frame. a transfer drive source; and a transmission mechanism configured to transmit driving force from the transfer drive source to the placement body, wherein the transmission mechanism includes: an output member coupled to an output shaft of the transfer drive source; and a driven member configured to be driven by the output member, wherein the placement body moves in conjunction with the driven member, wherein the driven member is not coupled to the output member and is configured to operate by being pressed by the output member, wherein the wheel drive source, the transfer drive source, and the output member are supported by the vehicle body frame, characterized in that the article transport vehicle further comprises a vehicle body cover, the placement body and the driven member are supported by the vehicle body cover, and the vehicle body cover covers the wheel drive source and the transfer drive source and is detachably attached to the vehicle body frame. an output member coupled to an output shaft of the transfer drive source; and a driven member configured to be driven by the output member, wherein the placement body moves in conjunction with the driven member, wherein the driven member is not coupled to the output member and is configured to operate by being pressed by the output member, wherein the wheel drive source, the transfer drive source, and the output member are supported by the vehicle body frame, characterized in that the article transport vehicle further comprises a vehicle body cover, the placement body and the driven member are supported by the vehicle body cover, and the vehicle body cover covers the wheel drive source and the transfer drive source and is detachably attached to the vehicle body frame.