A bulb type electrodeless discharge lamp, comprising a recessed part (102), wherein the maximum diameter of a light emitting tube (101) is 60 to 90 mm and the tube wall load of the light emitting tube (101) is 0.07 to 0.11 W/cm.sup.2, and a relation between the diameter Dc of the recessed part (102) and an interval .DELTA.h between the top of the recessed part (102) and the top part of the light emitting tube (101) meets the requirement of .DELTA.h.ltoreq.1.15.times.Dc+1.25 [mm].