A carriage-type conveyance device comprising: - guide rails (2a, 2b) for laying on a floor floor surface, - a conveyance carriage which is supported so as to travel on the guide rails (2a, 2b) in an aisle along a conveyance carriage travelling path and is provided with: an object support base movable vertically, elevating cam follower rollers which move vertically in conjunction with a vertical movement of the object support base, an automatic lock means which locks the object support base being raised at a rising limit position, and unlocking cam follower rollers for unlocking the automatic lock means, and - elevating cam rails (50, 52) which push up the elevating cam follower rollers and unlocking cam rails which switch the unlocking cam follower rollers to unlocking positions, laid on the side of the conveyance carriage traveling path, wherein the unlocking cam follower rollers are disposed higher than a conveyance carriage supporting level of the guide rails (2a, 2b), and the elevating cam follower rollers project further downward than the conveyance carriage supporting level of the guide rails (2a, 2b) when the object support base is at a lowering limit position, and positioned higher than the conveyance carriage supporting level of the guide rails (2a, 2b) when the object support base is at a rising limit position, characterized in that the carriage-type conveyance device further comprises - a crossing aisle floor member for laying in an aisle crossing area crossing the aisle in the conveyance carriage traveling path and laid at the same level as the conveyance carriage supporting level of the guide rails (2a, 2b), and - slope floor members (46a, 46b) provided in the front and rear of this crossing aisle floor member in the crossing aisle direction for filling a level difference from the floor surface, and wherein the elevating cam rails (50, 52), which push up the object support base to the rising limit position, are laid on the upstream side of the aisle crossing area along the path, so that the conveyance carriage can pass through the aisle crossing area in a state that the object support base is locked at the rising limit position by the automatic lock means. - guide rails (2a, 2b) for laying on a floor floor surface, - a conveyance carriage which is supported so as to travel on the guide rails (2a, 2b) in an aisle along a conveyance carriage travelling path and is provided with: an object support base movable vertically, elevating cam follower rollers which move vertically in conjunction with a vertical movement of the object support base, an automatic lock means which locks the object support base being raised at a rising limit position, and unlocking cam follower rollers for unlocking the automatic lock means, and an object support base movable vertically, elevating cam follower rollers which move vertically in conjunction with a vertical movement of the object support base, an automatic lock means which locks the object support base being raised at a rising limit position, and unlocking cam follower rollers for unlocking the automatic lock means, and - elevating cam rails (50, 52) which push up the elevating cam follower rollers and unlocking cam rails which switch the unlocking cam follower rollers to unlocking positions, laid on the side of the conveyance carriage traveling path, wherein the unlocking cam follower rollers are disposed higher than a conveyance carriage supporting level of the guide rails (2a, 2b), and the elevating cam follower rollers project further downward than the conveyance carriage supporting level of the guide rails (2a, 2b) when the object support base is at a lowering limit position, and positioned higher than the conveyance carriage supporting level of the guide rails (2a, 2b) when the object support base is at a rising limit position, characterized in that the carriage-type conveyance device further comprises - a crossing aisle floor member for laying in an aisle crossing area crossing the aisle in the conveyance carriage traveling path and laid at the same level as the conveyance carriage supporting level of the guide rails (2a, 2b), and - slope floor members (46a, 46b) provided in the front and rear of this crossing aisle floor member in the crossing aisle direction for filling a level difference from the floor surface, and