Nikkei down 0.4%, oil fall weighs on trading firms

(Updates to midsession)

TOKYO, May 28 (Reuters) - Japan's Nikkei average slipped 0.4 percent on Wednesday as oil's fall from record highs pressured commodity-linked shares such as trading firm Mitsubishi Corp (8058.T).

The benchmark Nikkei average .N225 fell 56.78 points to end the morning session at 13,836.53, after advancing 1.5 percent the previous day.

The broader Topix index shed 0.5 percent or 7.00 points to 1,361.25. (Reporting by Aiko Hayashi)