To provide a temperature indicator for eliminating a slide resistance in a movable member, and sensitively detecting a temperature of an object to be measured.

The temperature indicator 1 comprises: a case 2 attached to the object to be measured; a temperature reaction member 15 attached to the case 2 at one end, and contracted or expanded due to a temperature change; the movable member 9 attached to the other end of the temperature reaction member 15, and displaced in the direction of the center of an axis of the case 2 due to a contraction or an expansion of the temperature reaction member 15; a low temperature indicating section 16 attached to one end of the movable member 9, and protruded from the case 2 when the temperature is a predetermined low temperature or less; a high temperature indicating section 18 attached to the other end of the movable member 9, and protruded from the case 2 when the temperature is a predetermined high temperature or more; a thin plate diaphragm 7 fixed to the case 2 on an outer circumference, and fixed to one end of the movable member 9 on an inner circumference; and a thin plate diaphragm 8 fixed to the case 2 on an outer circumference, and fixed to the other end of the movable member 9 on an inner circumference. The movable member 9 is guided by the diaphragms 7, 8 in the direction of the center of the axis of the case 2.