To provide a fluorescent lamp which is in explusive, which has large heat radiation, and in which brightness is increased without much labor.

This is the fluorescent lamp having a coating film layer containing sodium silicate and/or potassium silicate at the base part. Silica and alumina other than sodium silicate and/or potassium silicate can be contained in this coating film layer. Furthermore, an effect can be further enhanced by containing tin oxide additionally. Besides, zirconia, titania, and other metal oxides can be contained in this coating film layer. In addition, metal nitride can be contained. This is the fluorescent lamp having the coating film layer in the base part. The coating film layer may be formed on a metal plate, and the metal plate having this coating film layer may be mounted on the fluorescent lamp.