The present invention makes it easy to lay-out a carriage traveling path crossing an aisle for a vehicle, etc., in a conveyance device using a carriage which has an object support base movable vertically controlled by cam rails on the floor side, and is characterized in that an automatic lock means for locking an object support base 11 at a rising limit position is provided, unlocking cam follower rollers 44 of this automatic lock means are provided higher than a conveyance carriage supporting level L of a carriage traveling path P, a cam follower roller 32 for elevating the object support base 11 is positioned higher than the conveyance carriage supporting level L when the object support base 11 is at the rising limit position, and in an area in which the carriage traveling path and the aisle crosses each other, a crossing aisle floor member 45 is laid at the same level as the conveyance carriage supporting level L, and the conveyance carriage 1 can pass through this aisle crossing area in a state that the object support base 11 is locked at the rising limit position by the automatic lock means.