Cap opening and closing apparatus

A cap opening and closing apparatus that opens and closes caps of a plurality of micro tubes, comprising:

• a first rotary member that rotates around a first rotation axis;
• a plurality of first engaging portions which are mounted on the first rotary member, and which respectively uncap the plurality of micro tubes by temporarily engaging with the caps during rotation of the first rotary member;
• a second rotary member that rotates around a second rotation axis different from the first rotation axis;
• and
• a plurality of capping units that, during rotation of the second rotary member, respectively cap the plurality of micro tubes by converting a force of the rotation into a force that temporarily pushes upper surfaces of the caps,
• wherein the plurality of first engaging portions uncap the plurality of micro tubes until single rotation of the first rotary member is completed by respectively engaging with the caps at different rotation positions of the first rotary member, and the plurality of capping units cap the plurality of micro tubes until single rotation of the second rotary member is completed by respectively pressing the upper surfaces of the caps at different rotation positions of the second rotary member.