To enable the assembly of a second bearing in a simple form like that of a movable bearing and to enable the function of fixed bearing in the final condition by strict prescriptions in another work process.

A pump unit 1 has a radial piston pump 6 provided with at least one pump piston 24 in a pump block 3 and a drive motor 2 incorporated in the pump block 3. A shaft 10 is driven by the drive motor 2, the shaft 10 drives the pump piston 24. The shaft 10 is supported by a first bearing 11 in a casing 13 of the drive motor 2, and supported in the pump block 3 by a second bearing 14 arranged in a shaft end 27 in a side of the pump piston 24. The second bearing 14 is a fixed bearing, its outer ring 17 is inserted in the pump block 3 by a movable fit, and held-non-turnable further non-slidable in an axial direction by displacement of a material of the pump block 3 toward the circumference of the outer ring 17.