The present invention provides a luminous storage material that emits a blue or bluish green light, that has high persistence, that is thermally and structurally stable, and that exhibits a high weather resistance in chemically severe conditions. The present invention also provides manufacturing method for this material. A blue aluminum silicate luminous storage material according to this invention is composed of a powdered product that has been activated by Eu.sup.2+ wherein its composition formula is expressed as follows:(M.sub.l-n-m M*.sub.n -Eu.sub.m)(Al.sub.1-x Si.sub.3/4 x.quadrature..sub.1/4.times.).sub.2 O.sub.4(wherein .quadrature. is vacancy; M is one or more types of alkali earth metal elements selected from a group of magnesium, calcium, strontium, and barium; M* is one or more types of bivalent metal elements selected from a group of manganese, zinc, and cadmium; and (n), (m), and (x) consist of numerical values meeting the ranges 0.ltoreq.n.ltoreq.0.2, 0