Keisuke Iwashita sent the home side on their way after just two minutes before Edamura doubled the advantage eight minutes later.

Akihiro Hyodo added a third midway through the first half, while Ryoichi Maeda gave the visitors hope a minute before half-time.

But the home side continued to control the contest after the break and Edamura restored the three goal cushion just before the hour mark before Shinji Okazaki sealed the win with 15 minutes remaining.

Shimizu moved up to third place level on points with second-placed Kawasaki Frontale, who face Montedio Yamagata tomorrow, eight points adrift of Kashima, who entertain FC Tokyo tomorrow.

Sanfrecce Hiroshima moved up to fourth place, two points further off the pace in the chasing pack behind Kashima, after Tomoaki Makino and Yosuke Kashiwagi scored in the first half to secure a 2-1 win over Urawa Red Diamonds.

The seventh-placed Reds pulled a goal back with 21 minutes remaining through Marcus Tulio Tanaka but failed to find a second to remain 13 points adrift of Kashima.

Albirex Niigata dropped to fifth, a point behind fourth-placed Sanfrecce, after suffering a 2-1 home defeat by Kyoto Purple Sanga.

Elsewhere, Yuji Nakazawa's 88th minute own goal handed Kashiwa Reysol a 1-1 draw with Yokohama F. Marinos, while JEF United shared a 1-1 draw with Omiya Ardija.