Solid immersion lens holder and image acquisition device

A solid immersion lens holder holding a solid immersion lens at a front side of an objective lens, the solid immersion lens including a spherical face portion disposed to face the objective lens and a contact portion having a contact face configured to contact an observation object, and the solid immersion lens holder comprising:

• a first member having a first opening disposing the spherical face portion therein so that a part of the spherical face portion protrudes toward an objective lens side, and three plate portions disposed on the objective lens side with respect to the first opening, each of the three plate portions being provided with a protrusion portion capable of contacting the spherical face portion;
• and
• a second member having a second opening disposing the contact portion therein so that the contact face protrudes toward a side opposite to the objective lens side.