This paper reports the following 23 psocopteran species collected through biological investigations of the Imperial Palace of Japan in 1998 and 1999; Trogiidae- Cerobasis guestfalica (Kolbe); Amphientomidae - Stimulopalpus japonicus Enderlein; Caeciliusidae - Paracaecilius japanus (Enderlein)， Valenzuela badiostigma (Enderlein), V.oyamai (Enderlein)， V. flavidus (Stephens)(new record from Japan)， V. scriptus (Enderlein); Stenopsocidae - Graphopsocus cruciatus (Linnaeus)， Stenopsocus aphidiformis Enderlein; Ectopsocidae - Ectopsocopsis cryptomeriae (Enderlein)，E ctopsocus sp.，E. briggsi McLa...