| abstract |
A thermal recording sheet comprising, on one surface of square, transparent film, a thermal recording layer containing leuco dye and a coloration agent and a protection layer mainly containing water-based resin, wherein corner parts ( 1 a , 1 b , 1 c , 1 d ) including at least one marked corner part ( 1 a ) are provided at its four corners. The corner parts ( 1 a, 1 b , 1 c , 1 d ) respectively have end edges each with radius of curvature of at least 5 mm, and the end edge of the marked corner part ( 1 a ) is provided substantially with a maximum radius of curvature or a minimum radius of curvature. |