Force sensor module

A force sensor module comprising:

• a force sensor including a strain element that deflects in response to an external force and configured to detect the external force according to the amount of deflection of the strain element;
• a housing that accommodates the force sensor;
• and
• a force transferring section configured to transfer the external force to the stain element, the force transferring section being accommodated in the housing so as to be in contact with the strain element and having a part that includes an end of the force transferring section and that protrudes outside the housing through a surface of the housing,
• the amount of protrusion of the part of the force transferring section measured from the surface of the housing being set such that the force sensor is not damaged even in a case where the end lies in the same plane as the surface of the housing,
• the force sensor including:
• a first substrate having light transparency;
• a metasurface pattern provided on a first principal surface of the first substrate;
• a second substrate provided so as to face the first substrate and including a second principal surface that faces the first principal surface;
• a reflective layer provided on the second principal surface;
• and
• a spacer defining a spacing between the first substrate and the second substrate, and
• the second substrate being the strain element.