Hirai Ken (平井堅, 1972 nî 1 goe̍h 17 ji̍t chhut-sì ) sī Ji̍t-pún 1-ê R&B koa-chhiú, 1990 nî-tāi chho·-kî chhut-tō, 2000 nî khai-sí tōa chhut-miâ. I tī Tāi-pán-hú chhut-sì, tī Nabari tōa-hàn.