An objective optical system for endoscope includes, in order from an object side: a first lens having a negative refractive power a second meniscus lens having a positive refractive power with a convex surface thereof directed toward the object side an aperture stop a third lens having a biconvex shape, and a cemented lens having a positive refractive power as a whole, in which a fourth lens having a biconvex shape and a fifth lens having a negative refractive power are cemented.