Chromene compound

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PROBLEM TO BE SOLVED : To provide a chromene compound having little discoloration in a non-irradiation state.SOLUTION : This chromene compound is represented by general formula (1) {in the formula, Ris an alkyl group; Rand Rare each independently a hydrogen atom, an alkyl group or an alkoxy group; Rand Rare each independently a hydrogen atom or the like; Rand Rare each independently a hydroxy group or the like; Rand Rare each independently an aryl group or the like; Z is a divalent group selected from an alkylene group, a cycloalkylene group or an arylene group; a is an integer of 0-2; and b is an integer of 0-4}.