To provide a reversibly thermal-discoloring laminate satisfying both of thermal-discoloring function and safety.

The reversibly thermal-discoloring laminate is obtained by providing a reversibly thermal-discoloring layer with a thickness of 10-100 μm containing a microcapsule pigment, which includes a reversibly thermal- discoloring composition consisting of an electron donating color forming organic compound, an electron acceptive compound and a medium controlling the color forming reaction generating temperature of both of them, and a photopolymerizable composition on a support. When the laminate is dipped in water (60°C), of which the amount is 2 ml per 1 cm2 of the coating area of the reversibly thermal-discoloring layer, for 30 min and this liquid is titrated with a potassium permanganese solution, the consumption of potassium permanganese is 10 ppm or less.