A manual locking device, comprising: a transmission mechanism for transmitting a driving force from a drive source to a door leaf to cause the door leaf to move between a fully open position and a fully closed position; at least one moving portion provided on the transmission mechanism and configured to move in synchronization with opening and closing of the door leaf; a restraining portion configured to contact with the at least one moving portion to restrain movement of the at least one moving portion in an opening-closing direction of the door leaf; an operation portion configured to be manually operated to produce an operating force; a locking portion configured to accomplish locking when the door leaf is at the fully closed position, by moving the restraining portion by the operating force of the operation portion from an unlocking position in which the movement of the at least one moving portion is not restrained to a locking position in which the movement of the at least one moving portion is restrained, characterised in that the manual locking device further comprises a lock restraining portion configured to allow locking by the locking portion only when the door leaf is at the fully closed position, wherein the restraining portion includes an engaged portion (61e, 62e); and wherein the lock restraining portion includes: an engaging portion (91h, 92h) configured to contact with the engaged portion (61e, 62e) to prevent movement of the restraining portion; and a pressed portion (91d, 92d) configured to be pressed by the at least one moving portion in a closing direction when the door leaf reaches the fully closed position, such that the engaging portion (91h, 92h) comes out of contact with the engaged portion (61e, 62e). a transmission mechanism for transmitting a driving force from a drive source to a door leaf to cause the door leaf to move between a fully open position and a fully closed position; at least one moving portion provided on the transmission mechanism and configured to move in synchronization with opening and closing of the door leaf; a restraining portion configured to contact with the at least one moving portion to restrain movement of the at least one moving portion in an opening-closing direction of the door leaf; an operation portion configured to be manually operated to produce an operating force; a locking portion configured to accomplish locking when the door leaf is at the fully closed position, by moving the restraining portion by the operating force of the operation portion from an unlocking position in which the movement of the at least one moving portion is not restrained to a locking position in which the movement of the at least one moving portion is restrained, characterised in that the manual locking device further comprises a lock restraining portion configured to allow locking by the locking portion only when the door leaf is at the fully closed position, wherein the restraining portion includes an engaged portion (61e, 62e); and wherein the lock restraining portion includes: an engaging portion (91h, 92h) configured to contact with the engaged portion (61e, 62e) to prevent movement of the restraining portion; and a pressed portion (91d, 92d) configured to be pressed by the at least one moving portion in a closing direction when the door leaf reaches the fully closed position, such that the engaging portion (91h, 92h) comes out of contact with the engaged portion (61e, 62e). an engaging portion (91h, 92h) configured to contact with the engaged portion (61e, 62e) to prevent movement of the restraining portion; and a pressed portion (91d, 92d) configured to be pressed by the at least one moving portion in a closing direction when the door leaf reaches the fully closed position, such that the engaging portion (91h, 92h) comes out of contact with the engaged portion (61e, 62e).