Thermal detector, thermal detection device and electronic instrument, and method for manufacturing thermal detector

A thermal detector comprising:

• a substrate having a concave portion, the concave portion having a bottom surface that is a parabolic surface and forms a light-reflecting curved surface;
• a thermal detection element including a light-absorbing film;
• and
• a support member supporting the thermal detection element with a cavity being provided between the substrate and the support member,
• the thermal detection element defining partially an outer periphery of the thermal detector at a side opposite the substrate relative to the support member along a normal line of the substrate that passes through a center of the thermal detection element,
• the light-reflecting curved surface and the light-absorbing film overlapping each other in plan view, the parabolic surface having an area larger than an area of the light-absorbing film in plan view, the parabolic surface being curved so that incident light is reflected by the parabolic surface and traveled through the light-absorbing film toward a focus point positioned on the normal line of the substrate and positioned at an outer side relative to the outer periphery of the thermal detector defined by the thermal detection element.