Contact-type power supply apparatus and contact unit

A contact unit applied to a contact-type power supply apparatus including a first cylindrical body and a second cylindrical body configured to surround the first cylindrical body, to be disposed concentrically to the first cylindrical body, and to be rotatable around a central axis of the first cylindrical body, the contact unit comprising:

• a contact body configured to face an annular body in an axial direction of the first cylindrical body, to surround the first cylindrical body, to be disposed concentrically to the first cylindrical body, to have a contact surface that is in contact with the inclined surface, and to being capable of receive an electric potential of the annular body by sliding with the annular body, and the annular body being configured to be in non-contact with the second cylindrical body, and to have an end surface being an inclined surface having a tapered shape;
• and
• an annular support fixed to the second cylindrical body, being capable of surrounding the first cylindrical body, and supporting the contact body,
• a relative distance between the support and the contact body in the axial direction being variable.