[Object] Materials may be used as adhesives and the like which may be cured with active energy rays, and cured products may be easily removed and separated from substrates by a method such as a hygrothermal degradation method as required such as when the products are to be disposed of. [Solution] A (meth)acrylic block copolymer includes a methacrylic polymer block (A) having at least one or more active energy ray curable groups represented by General Formula (1) below, and a (meth)acrylic polymer block (B) having no active energy ray curable groups, (wherein R 1 is a methyl group, R 2 and R 3 are each independently a hydrocarbon group having 1 to 6 carbon atoms, and n is an integer of 1 to 5).