PURPOSE: To improve the magnetic record/reproduction efficiency by reducing the width of an auxiliary magnetic pole formed by a groove part in the track width direction in comparison with the width of a guard material block in the track width direction.

CONSTITUTION: A main magnetic pole 2 made of a thin layer of solft magnetic material is held between guard material blocks 4 and 4'. These blocks and magnetic pole are unified together into a body. The blocks 4 and 4' are formed with nonmagnetic material parts 5 and 5' extending up to the desired positions from a contact surface with a magnetic recording medium and magnetic material parts 6 and 6' joined to the back of the parts 5 and 5' respectively. Auxiliary magnetic poles 7 and 7' joined to the pole 2 with a coil C wound therearound are provided at the parts 6 and 6'. The width W1 of the poles 7 and 7' is reduced in the track width direction compared with the width W2 of blocks 4 and 4' in the track width direction with correspondence to the prescribed track width. The coil C is wound around the pole 2 via the poles 7 and 7' through groove parts 9 and 9'. In such a way, the winding length is reduced to obtain a desired magnetic flux. Thus the efficiency is improved for magnetic record and reproduction.