A lighting apparatus includes a body, a light source unit disposed on the body to generate light, and a lens disposed on the body to refract light generated from the light source unit. The lens includes a light introduction portion having a light introduction surface for introduction of light and a light emission portion having a light emission surface for passage of light having passed through the light introduction portion, and the light introduction surface of the light introduction portion and the light emission surface of the light emission portion are configured to satisfy cos a1−cos θ1/cos a2−cos θ2