An outer coil (13) and an inner coil (14) are joined in parallel with a distal end portion of a core (11) of a guide wire (10). A winding direction of a strand (8) of the outer coil (13) is the same as that of a strand (9) of the inner coil (14). Diameters of the outer and inner coils (13, 14) increase or decrease when rotation of the core (11) is transmitted and thereby rotation transmission capability is improved. An outer space wound portion (13A) and an inner space wound portion (14A) are formed in corresponding positions in the outer coil (13) and the inner coil (14), respectively, in a core direction. Even if the guide wire (10) has a double-coil structure, the outer and inner space wound portions (13A, 14A) improve flexibility of the guide wire (10). A coil pitch of the outer space wound portion (13A) differs from a coil pitch of the inner space wound portion (14A). Thereby, engagement of the strands (8, 9) is prevented.
