Ball screw device and steering device

A ball screw device, comprising:

• a screw shaft having a groove on an outer periphery of the screw shaft;
• a ball screw nut having a groove on an inner periphery of the ball screw nut;
• a plurality of return tubes;
• and
• a plurality of balls, wherein
• the groove of the screw shaft faces the groove of the ball screw nut to form a helical rolling path,
• each of the plurality of return tubes includes
• a return path configured to create a connection between two points of the rolling path, the return path and the rolling path forming a circulation path in which the balls are disposed,
• a first end portion that serves as an entrance for the balls to enter the return path when the screw shaft or the ball screw nut rotates clockwise, and that serves as an exit for the balls to be discharged from the return path when the screw shaft or the ball screw nut rotates counterclockwise, and
• a second end portion that serves as an exit for the balls to be discharged from the return path when the screw shaft or the ball screw nut rotates clockwise, and that serves as an entrance for the balls to enter the return path when the screw shaft or the ball screw nut rotates counterclockwise,
• the ball screw nut has a plurality of attaching portions configured such that the plurality of return tubes is attached from a same attaching direction,
• the plurality of return tubes includes at least a first return tube and a second return tube,
• a position of the first end portion of the second return tube relative to a position of the first end portion of the first return tube in a circumferential direction of the ball screw nut is a first relative position, and a position of the second end portion of the second return tube relative to a position of the second end portion of the first return tube in the circumferential direction is a second relative position, and
• at least one of the first relative position and the second relative position includes offset in the circumferential direction.