Abstract: The object of the present invention is to provide a glass composition which has a sufficient bonding strength for bonding a fluorescent film with a glass tube, does not hinder decomposition of the binder and is effective as an adhesive material, and to provide a fluorescent lamp using the glass composition. The object can be achieved by a glass composition, represented by the general formula,xMO.yB.sub.2 O.sub.3.zM'.sub.2 O.sub.3.uM"O.sub.2.vM'".sub.2 O.sub.5in which M is at least one element of Mg, Ca, Sr, Ba and Zn, M' is at least one element of Al, Sc, Y and lanthanoid elements, M" is at least one element of Ti, Zr, Hf, Th and Si, M'" is at least one element of Nb and Ta, x, y, z, u and v satisfy the relationships of 0<x.ltoreq.70, 15.ltoreq.y.ltoreq.80, 0.ltoreq.z.ltoreq.50, 0.ltoreq.u.ltoreq.30, 0.ltoreq.v.ltoreq.30, 0.5.ltoreq.u+v.ltoreq.50 and x+y+z+u+v=100, represented by mol %, and by a fluorescent lamp, in which the glass composition is incorporated in a phosphor layer in a proportion of 0.