A reinforcing bar connector is capable of connecting reinforcing bars easily and in a short time without using a screw-tightening tool. The reinforcing bar connector has a reinforcing bar holding section having a female screw thread part screwed on a male screw part on the outer periphery of the reinforcing bar; a flat, plate-shaped engaging section extending in the direction of a center axis C from the reinforcing bar holding section; a locking projection provided on the engaging section; and a locking hole provided in the engaging section and allowing for engagement of the locking projection of another reinforcing bar connector to the locking hole. A stopper for preventing the locking projection from falling out of the locking hole is provided at a distal end of the locking projection. An attaching hole having an inner diameter through which the stopper can pass is formed next to the engaging hole. A communicating part through which the locking projection can pass is formed between the attaching hole and the locking hole.