The circuit board transportation device has: a guide member that is provided in such a manner as to extend in the transport direction and has a guide surface that comes into abutment with a circuit board from the outside of the circuit board in a perpendicular direction that is a direction perpendicular to the transport direction; a conveyor belt that extends in the transport direction to support an end of the circuit board; and a drive unit that moves the conveyor belt. The conveyor belt has: a belt base portion that is located under the guide member and extends both ways of the perpendicular direction from the position of the guide surface; and a projection that extends upward from the belt base portion up to a position between upper and lower ends of the guide surface. The conveyor belt supports the circuit board by means of the projection.
