Light source and projector

摘要

A light source that prevents broken pieces from dispersing to the outside without increasing the number of components while efficiently cooling a light-emitting tube is provided. The light source ( 10 ) has: a light-emitting tube ( 11 ) having a light-emitting portion ( 111 ) where light beam is emitted by electric discharge between electrodes and a sealing portion ( 112 ) provided on both sides of the light-emitting portion ( 111 ); a reflector ( 12 ) that reflects the light beam emitted by the light-emitting tube ( 11 ) forward after aligning in a predetermined direction; a cover ( 16 ) covering a light-irradiation opening of the reflector ( 12 ) and having an opening for irradiating the light beam reflected by the reflector ( 12 ), the cover having a heat-radiation fin ( 162 ) on the outside thereof and being made of a heat-conductive material to absorb the heat from the light-emitting tube ( 11 ), the absorbed heat being conducted to the heat-radiation fin ( 162 ); and a transparent member ( 14 ) that covers the opening of the cover ( 16 ).