Mechanical pencil

A mechanical pencil, comprising:

• a cylindrical barrel,
• a rotary member having a ball chuck allowing advance of lead and blocking retraction,
• a rotation drive mechanism having a rotary part and driving the rotary part to rotate in one direction upon receiving a retracting motion in the axial direction due to writing pressure received by the lead clutched by the ball chuck and an advancing motion in the axial direction due to release of the writing pressure, and
• a cylindrical member made of metal provided at one of the cylindrical barrel and the rotary member,
• the rotary member configured so as to rotate upon receiving rotational drive force of the rotary part whereby the lead clutched by the ball chuck rotates,
• the other of the cylindrical barrel and the rotary member slidingly contacting the surface of the cylindrical member whereby rotation of the rotary member due to the rotation drive mechanism is supported.