A method of calculating a quantity of light by measuring, by using an
adhering force measuring unit (71), the adhering force of an ultraviolet
light-curable tape (11 or 21) relying upon the quantity of ultraviolet
light with which the ultraviolet light-curable tape is irradiated from an
ultraviolet light irradiation unit (61), and calculating, by using a
calculation unit, the quantity of ultraviolet light corresponding to a
predetermined adhering force, from the measured adhering force of the
ultraviolet light-curable tape, and a device therefor. The predetermined
adhering force may have been stored in advance in the storage unit or the
predetermined adhering force may be determined in advance relying upon at
least either one of the kind of the ultraviolet light-curable tape or the
elapsed time of the ultraviolet light-curable tape. Then, the quantity of
light necessary for the ultraviolet light-curable tape that is used is
automatically calculated to avoid a problem caused by an insufficient
quantity of light or an excess quantity of light.