Norwich Union has warned investors thinking of putting money into Japan that it is not for the faint hearted.
The Nikkei has seen a reversal in its fortunes this year following a decade-long decline. Growth is currently double that of the UK and US stocks markets.
But Norwich Union investment strategist Mike Grimble warns that only investors who can tolerate high levels of risk should put their money in Japan.
He believes Japanese investors are currently using the market strength, which is driven by US money, to offload shares.
Grimble says that until these investors show the confidence to invest in their own domestic market any potential growth will be limited.