越中国
The area of present-day Oyabe was part of ancient Etchū Province and developed as a post station on the Hokuriku kaidō highway during the Edo period. The town of Isurugi was created with the establishment of the municipalities system on April 1, 1889. It was raised to city status upon merging with the town of Tochu on August 1, 1962, and was renamed Oyabe.