To provide a displacement increasing mechanism with a displacement final output end to be put in contact with a treated member with superior rigidity while imparting increased displacement superior in response property to a displacement final output end, and to provide a treatment device.

The displacement increasing mechanism 11 comprises an expander 12 for operating as a power point, and a plurality of arm bodies 22 including an arm body 33 on an displacement starting end input side, which is positioned and fixed via a supporting point portion 38 to be displaced by receiving the thrusting operation of the expander 12, and an arm body 53 on the displacement terminal end output side, which is positioned and fixed via a supporting point portion 59 to be thrust by an arm body 23 on a displacement imparting side including the arm body 33 and which has a displacement final output end 60 for increasing and outputting the displacement thereof. To at least the arm body 25 on the displacement receiving side, a parallel link mechanism is imparted for suppressing useless slip arising in the thrust contact with the arm body 23 on the displacement imparting side. The treatment device is equipped with the displacement increasing mechanism 11.

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