DEEP BODY THERMOMETER

A core body thermometer (1) includes a substrate (2); a heat receiving terminal (3) with which heat from a subject (O) is received and which divides the heat into first heat flow (Ipa) and second heat flow (Ipb) and causes the first heat flow (Ipa) and the second heat flow (Ipb) to flow out; a first heat flow measurement system (5) capable of measuring the first heat flow (Ipa) using a first input-side temperature sensor (6) and a first output-side temperature sensor (8); a second heat flow measurement system (11) capable of measuring the second heat flow (Ipb) using a second input-side temperature sensor (12) and a second output-side temperature sensor (14); a first thermal resistance body (10) provided between the heat receiving terminal (3) and the first input-side temperature sensor (6); and a second thermal resistance body (16) provided between the heat receiving terminal (3) and the second input-side temperature sensor (12). The core body thermometer (1) estimates a core body temperature (Tcore) of the subject (O) based on the first heat flow (Ipa) and the second heat flow (Ipb) flowing from the subject (O).