Japan’s flagship Nikkei 225 index has ended the week at 15,599.66, up 1.1 per cent.
The index had a week of losses but made a modest gain to close up on Friday, June 17.
It followed an announcement from the Bank of Japan (BoJ) yesterday which confirmed it was holding steady on its monetary stimulus programme.
The Japanese yen climbed higher on the announcement from the central bank.
The currency risen in the run-up to the UK’s referendum on EU membership as investors see it as a safe haven.
Katsunori Kitakura, lead strategist at Sumi Trust said: “If the UK were to leave the EU, this sentiment may spread to other countries within the continent and cause a risk off throughout the market.
“In that situation we can expect the yen to increase and the Japanese equity market to decrease. With such uncertainty, it would be advisable for the BoJ not to introduce policies prior to the referendum.”
The FTSE 100 has opened higher and is trading up 1.3 per cent to 6,025.29 at 8.53am.
