Bearing bush and composite motion apparatus using the same

【Task】 The clearance between the bearing bush and the shaft member is eliminated to eliminate backlash between the two, and such a shaft member can make good forward and backward movements, and the burden of dimensional control on both the bearing bush and the shaft member is reduced. Provided is a bearing bush that can be manufactured at low cost. [Solution] A bearing bush 4 for supporting the reciprocating motion of the shaft member 1 in the axial direction. The bearing bush 4 has a receiving hole through which the shaft member 1 passes, and a groove 40 is formed on the inner peripheral surface facing the receiving hole at a predetermined interval. It is formed repeatedly. The receiving hole has an inner diameter that is the same as or smaller than the outer diameter of the shaft member 1 and is in pressure contact with the outer peripheral surface of the shaft member 1 in a so-called interference fit state. [Selection] Figure 3