Biological data measurement device

A biological data measurement device, comprising:

• a substrate disposed at a position spaced a predetermined distance from a body surface of a living organism as a measuring object via a support member so that an air layer is formed between the substrate and the body surface,
• a temperature measurement means including an infrared thermometer for measuring a body surface temperature Tsk of the body surface and a substrate thermometer for measuring a substrate temperature Tsub of the substrate, wherein the temperature measurement means measures the body surface temperature Tsk and the substrate temperature Tsub in a same place at least twice at a first timing A and a second timing B, and
• a calculator operating such that an in vivo thermal resistance Rthbody is calculated from an equation Rthair×b/(a−b) wherein a difference between the body surface temperatures Tsk measured at the first timing A and measured at the second timing B is b, a difference between the substrate temperatures Tsub measured at the first timing A and measured at the second timing B is a, and a thermal resistance of the air layer is Rthair.