An object of the present invention is to provide: an alkaline earth metal silicate phosphor to which Eu is added as an activator, and which has an emission peak wavelength of 600 nm or more, high luminance and excellent color rendering properties; and a method for producing the alkaline earth metal silicate phosphor. An alkaline earth metal silicate phosphor of the present invention is represented by composition formula (1) and having an emission peak wavelength of 600 nm or more and a circularity of 85% or more. Composition formula (1): (SraCabBacEud)2SieOf (in the formula, a, b, c, d, e and f satisfy 0.4