An endoscope magnification optical system including: a first lens group that has positive power and includes at least a negative lens with a concave surface facing an object side, a positive lens with a convex surface facing an image side, and a doublet obtained by bonding a negative lens and a positive lens a second lens group that has negative power and includes at least a doublet obtained by bonding a negative lens and a positive lens and a third lens group that has positive power and includes at least a positive lens and a doublet obtained by bonding a negative lens and a positive lens, is configured such that predetermined conditions are satisfied.
