The present invention implements a technique capable of suppressing the deformation of a core body part when a cover part and a connector part are integrally formed by resin. A core body part (16) is provided with a first body part (11) and a second body part (12) that are coupled to each other in an axial direction (L). The first body part (11) is formed into a cylindrical shape extending in the axial direction (L), and a space surrounded by the inner peripheral surface of the first body part (11) forms a housing space (S) for a sliding member that slides on the inner peripheral surface in the axial direction (L). The outer peripheral surface of the second body part (12) and the inner peripheral surface of a bobbin body part (21) are in contact with each other, and the outer peripheral surface of the first body part (11), and the inner peripheral surface of an object end (21a) that is an end of the bobbin body part (21) on the side toward the first body part (11) from the second body part (12) in the axial direction (L) are apart from each other in at least a partial region in a circumferential direction.
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