Displacement conversion mechanism and tunable filter device

A displacement conversion mechanism, comprising:

• a base;
• a displacement element which is in contact with the base and displaces in a first direction;
• a first displacement portion which is in contact with the displacement element and is capable to displace in the first direction;
• a second displacement portion, having a first connection portion and a second connection portion, which connects to an end of the first displacement portion at the first connection portion, and connects to the base at the second connection portion;
• and
• a third displacement portion, having a third connection portion and a fourth connection portion, which connects to the other end of the first displacement portion at the third connection portion, and which connects to an end portion of the second displacement portion at the fourth connection portion, and the third displacement portion being capable to displace in a second direction intersecting with the first direction;
• wherein in each of the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion, stiffness in each of the first direction and the second direction is higher than stiffness in an other direction.