Abstract: Herein disclosed is a pipe fixing structure using a clamp member, which comprises: clamp means including a band-shaped plate member having wall portions opposed to each other and a plurality of projections on its inner periphery; a plurality of pipes each having a cylindrical member of heat-shrinkable resin fixed on its outer circumference in registration with the projections and adapted to be clamped by the clamp means; and fastening means for fastening the band-shaped plate member in a direction to bring the opposed wall portions toward each other so as to cause the projection to bite into the cylindrical members.