An improved VECSEL device is provided in which the gain of each of the quantum well layers can be increased in a periodic gain structure. A vertical external cavity surface emitting laser (VECSEL) device comprising: a substrate; a bottom DBR mirror formed on the substrate; a multiple quantum well layer formed on the bottom DBR mirror and comprising: a plurality of quantum well layers; first and second strain compensation layers sequentially formed above and below each of the quantum well layers to gradually relieve the strain of the quantum well layers; a capping layer formed on the multiple quantum well layer; an optical pump radiating a pump beam to the surface of the capping layer; and an external cavity mirror separated from and facing the bottom DBR mirror.