A chemiluminescence method characterized in that when a 1,2-dioxetane derivative of the formula 1: wherein each of R1, R2, R3, R4 and R5 which are independent of one another, is a hydrogen atom, an alkyl group or an aryl group, or each pair of R2 and R3, and R4 and R5, which are independent of each other, may form together a cyclic alkyl group, R6 is a hydroxyl group, an alkoxyl group, an aralkyloxy group, a group represented by —OSi(R8R9R10) (provided that each of R8, R9 and R10 which are independent of one another, is an alkyl group or an aryl group), a phosphate group or a group represented by S(C═O)R11 (provided that R11 is an alkyl group or an aryl group), and R7 is a hydrogen atom, a halogen atom, an alkyl group or an alkoxyl group, is let generate chemiluminescence by means of an activator selected from the group consisting of a base, an acid, a salt, a fluorine compound, an enzyme, a catalyst and an amine compound, a cationic surfactant and a fluorescent material are made to coexist.