To provide a thermometer wherein the indication can be read reasonably in a short time while multiple persons can read it at the same time.

A temperature is measured by utilizing thermal expansion and thermal contraction of a liquid 10. Here, a main body part 11 formed into a rod from a transparent member; a liquid reservoir part which is formed at one end in the main body part 11 and filled with the liquid 10; a thin pipe part 13 into which, formed in the main body part 11 while extending from the liquid reservoir part in the lengthwise direction of the main body part 11, the liquid 10 in the liquid reservoir part advances, graduations 14 formed at a plurality of places along the length direction of the main body part 11; and an opaque background part 15 which is positioned behind the thin pipe part 13 when viewed from respective graduation 14 and formed at a plurality of places in the lengthwise direction of the main body part 11; are provided.