To provide a metal phosphate exhibiting a higher brightness.

The metal phosphate comprises a compound in which a part of an element M2 in a compound represented by formula (1): M1M2aPbOc (wherein M1 is one or more alkali metal elements selected from the group consisting of Li, Na and K; M2 is one or more alkaline earth metal elements selected from the group consisting of Mg, Ca, Sr and Ba; a is a value in a range of 3 and 5; b is a value in a range of 2 and 4; and c is a value in a range of 8.5 and 15.5) is replaced with one or more elements (M3) selected from the group consisting of rare earth elements and Mn. The phosphor comprises the metal phosphate. The light-emitting element has the phosphor.