A method of manufacturing a radiographic imaging apparatus, including: providing a flexible base material on a support body and forming a substrate in which pixels are provided in a pixel region of a first surface of the base material; providing a terminal portion for connecting a cable on the first surface; connecting a circuit board for reading the electric charges from the pixels or driving the pixels to the terminal portion via the cable; peeling the substrate from the support body; and using a transport jig including a suction unit having suction members and a holding part having a holding member, to suction and support the first surface or a second surface opposite to the first surface with the suction members, and transporting the substrate peeled from the support body in a state where the circuit board is held by the holding member.