The present invention provides an optical system for a camera including: a first lens which has a negative refractive power and has a meniscus shape convex toward object side; a second lens which has a negative refractive power and has a convex surface toward object side; a third lens which has a positive refractive power and has a convex surface toward object side; and a fourth lens which has a positive refractive power and has a convex surface toward image side, wherein the optical system satisfies the following inequalities: 0.3