Plasticizing device and three dimensional modeling apparatus

A plasticizing device comprising:

• a rotor having:
• a rotation shaft and
• a groove-formed surface that includes a groove formed in a rotation direction and that is inclined from the rotation shaft in a radial direction;
• a facing unit having a facing surface circumferentially inclined so as to face the groove-formed surface in the radial direction, a heater heating a material to be supplied between the facing surface and the groove, and a communication hole through which the material plasticized by heat of the heater flows;
• a drive motor generating rotational driving force;
• a connection unit fitting to the rotor in a direction along a rotation shaft of the drive motor, connecting the rotation shaft of the drive motor and the rotor to each other, and transmitting the rotational driving force of the drive motor to the rotor;
• and
• an elastic member disposed between the rotor and the connection unit,
• wherein one of the connection unit and the rotor has a fitting protrusion portion projecting in a direction along the rotation shaft of the drive motor,
• the other of the connection unit and the rotor has a fitting recess portion info which the fitting protrusion portion is inserted in the direction along the rotation shaft of the drive motor,
• the elastic member is disposed inside the fitting recess portion, and
• the elastic member is disposed along an outer circumference of the rotor.