A reinforcing bar binding machine is provided with: a guide tube for guiding a wire from a wire reel mounted on a binding machine body; a curl guide; a wire cutting mechanism disposed between the guide tube and the curl guide; a first guide pin that is disposed at an end portion of the guide tube or in a vicinity of the end portion of the guide tube, and guides an outer side surface which is an outer side of a wire curve; a second guide pin that is disposed at the end portion of the guide tube or in a vicinity of the end portion of the guide tube, and guides an inner side surface which is an inner side of the wire curve; and a third guide pin that is disposed inside of the curl guide and guides the outer side surface. The wire is brought into contact with the first guide pin, the second guide pin, and the third guide pin, when the wire is fed around a reinforcing bar.