TOKYO, Jan 27 (Reuters) - Japanese Prime Minister Fumio Kishida said on Friday the economy's retreat to deflation cannot be ruled out because domestic demand-driven inflation remains feeble.

"Inflationary pressure based on domestic demand is not strong yet, as current consumer price increases are brought by global raw material inflation and a weak yen," Kishida told an upper house parliament session. (Reporting by Kantaro Komiya; Editing by Jacqueline Wong)