PROBLEM TO BE SOLVED: To solve the problem that the adverse effect exerted on the human body caused by an increase in the irradiation quantity of ultraviolet rays pouring on the earth by ozone depletion is indicated but there is no method capable of easily confirming the presence or irradiation quantity of ultraviolet rays in daily life and a counterplan can not be considered with respect to the injury to health.;SOLUTION: A material (1) forming a color corresponding to the irradiation quantity of solar rays or ultraviolet rays is utilized as a cash card (2) or a portable mirror (3). A material (4), on which a color capable of judging the irradiation quantity of ultraviolet rays is preliminarily printed, is applied to or integrated with the card. Further, the material (1) is used in a part of outdoor signboards (5) such as signboards provided at a place attracting a person's attention of a golf course or the like or the display matter (6) of the golf course to allow a walker or a player to easily know the irradiation intensity of ultraviolet rays. Furthermore, a method attaching an infrared sensor (8) to a portable telephone (7) to display the irradiation intensity of ultraviolet rays by visual sensation due to a display (9) or a built-in buzzer (10) can further increase the function of the portable telephone. The material (1) can be also attached to a strap (11).;COPYRIGHT: (C)2003,JPO
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