The unhedged version of the Dublin-domiciled fund has outperformed the TOPIX since its launch in 2009.
The £147m (€198m, $224m) fund is managed by Donald Farquharson and Sarah Whitley.
Director of retail marketing and distribution, James Budden, said: “As Japan engages in a process of structural reform and with companies announcing record profits, this new share class provides investors with access to our expertise while militating against fluctuations in the price of the yen versus sterling.”
Baillie Gifford has £11bn of Japanese assets under management.
In November, the Bank of Japan injected trillions of yen into its economy. Click here to read more.