An information recording member has an information recording film formed on a substrate either directly or with the interposition of at least one inorganic or organic protective layer and which undergoes change of atomic arrangement upon being irradiated by a recording beam. To improve the producibility of the member and its stability during its life, the recording film has and average composition in the direction of film thickness expressed by
where 2 ≤ × ≤ 40, 30 ≤ y ≤ 95, 3 ≤ z ≤ 45, O ≤ α ≤ 20 and M is at least one of As, Sb, Bi, S, Si, Ge, Sn, Pb, Aℓ, Ga, In, Tℓ. Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta. Members on which the recorded data is erasable can be produced.