PURPOSE: To provide an inexpensive information recording and reading device.

CONSTITUTION: As for a linear motor 31 moving a movable body 23 along an information track, a base main body 20 is provided with engagement projecting parts 20c and 20d. Besides, one corner yoke 28 out of the corner yokes 28 and 29 coupled by being interposed between both end parts of a center yoke 25 inserted in a coil 24 fixed to the movable body 23 and a side yoke 27 being in parallel with the yoke 25 is provided with a circular hole 28a and the other yoke 29 is provided with a long hole 29a. Then, the yoke 25 is positioned by respectively engaging the holes 28a and 29b with the projecting parts 20c and 20d of the main body 20.