Abstract: A solar radiation sensor comprises a light sensing element 1 detecting the uantity of light entering therein, and first and second lead legs 4, 5 each conducting an electric signal representing the quantity of the light detected by the light sensing element 2. Light sensing element 2 and first and second lead legs 4, 5 are supported on a sensor casing body 1, so that light sensing element 2 is housed inside a transparent cover 3. Each of first and second lead legs 4, 5 has one end 4a, 5a formed into a contact portion connected to light sensing element 2 and the other end 4b, 5b formed into an external connecting terminal, thereby reducing the number of welded or soldered connections. An engaging ridge 1a is provided on the sensor casing body 1 to fix light sensing element 2 with respect to cover 3. First and second lead legs 4, 5 are integrated with sensor casing body 1.