Bearing cup and cross shaft joint

A bearing cup for cross shaft joint including:

• a cross shaft having four shaft portions arranged in a cross shape;
• and a joint yoke having fitting holes into which the shaft portions are respectively fitted, the bearing cup comprising:
• a cylindrical portion, in which an opening portion for receiving the shaft portion is formed in one end of the cylindrical portion in an axis direction;
• and
• a bottom portion that closes the other end of the cylindrical portion in the axis direction, wherein
• the bearing cup is press-fitted into the fitting hole and supports the shaft portion through a rolling element so that the shaft portion is able to rotate,
• the bearing cup is fitted onto the shaft portion inside the fitting hole and holds the rolling element with the shaft portion, and
• a diameter of an inner peripheral surface of the cylindrical portion is smaller on the opening portion side than the bottom portion side in a free state of the bearing cup before being press-fitted into the fitting hole.