"Eejanaika" (ええじゃないか) is the debut single of the Japanese pop group Johnny's WEST.

It was released on April 23, 2014.

It reached number one on the Weekly Oricon Singles Chart.

[1] It was the 22nd best-selling single of the year in Japan, with 307,948 copies.

[2] On the theater performance of Naniwa Zamurai Hello Tokyo, the fans chose songs among 10-13 different songs, and through that Eejanaika was chosen.