To provide a reinforcing bar binding machine capable of giving a peculiar winding to a wire in high accuracy.

The reinforcing bar binding machine gives a peculiar winding to the wire at a guiding section 6 of a wire 5 and sends and winds the wire around reinforcing bars 7 and after that, cuts the root side of the wire 5 and twists the wound wire to bind the reinforcing bars, wherein the end part of a guiding tube 8 to guide sending of the wire 5, a wire cutting mechanism 11 to cut the wire after sending out a predetermined quantity of the wire 5 and a curl guide 12 to curve the wire 5 sent from the wire cutting mechanism 11, are arranged in order at the guiding section and the first guide pin 23 and the second guide pin 24 to guide the outside face and the inside face each which become the outside and the inside of the curve of the wire 5, are arranged at or near the end part of the guiding tube 8 and the third guide pin 25 to guide the outside face of the curve of the wire 5 is provided at the inside of the tip of the curl guide 12 and when the wire 5 is sent, the wire 5 is made in contact with the first to the third guide pin 23 to 25.