A carriage-type conveying apparatus with a workpiece support base and an elevating drive has a passive shaft interlocked with the elevating drive and a lock to prevent descent of the workpiece support base A power source carriage capable of traveling synchronously with the conveying carriage is aside of a traveling path of the conveying carriage at a workpiece support height changing position so as to be reciprocable along the traveling path. The power source carriage has a transmission shaft driven by a power source and a separable interlock to interlock the passive shaft and a transmission shaft with each other.