To obtain a temperature compensation lens (collimator lens) capable of more easily performing a focusing correction in accordance with a temperature fluctuation, and to obtain an optical device using temperature compensation lens.

The temperature compensation lens is provided with at least one positive lens and at least one negative lens, and two or more lenses are formed of different lens materials, and provided that the refractive index of material for an i-th lens in order form the exit side of a luminous flux is expressed by (ni), the rate-ofchange of the refractive index (ni) with reference to the temperature rise (dt) is expressed by dni/dt (1/°C), and the power of the i-th lens is expressed by i (1/mm), a conditional expression (1) should be satisfied.