He was also an excellent waka poet; his poems are compiled in his own anthology "Seishinkoshu" and also recorded in other anthologies of Japanese poems compiled by the Imperial order, including "Gosen Wakashu" (Later selected collection of Japanese poetry).
また、和歌に秀で、歌集『清慎公集』があり、『後撰和歌集』等の勅撰集に彼の和歌が採録されている。