Biodiversity of Elateridae in three forest types, i.e., larch plantations (Larix kaempferi (Lamb.) Carriere), secondary forest, and primary forest, was investigated and compared. Click beetles were captured with malaise traps in 46 stands in three 14-d periods in June, July, and August. A total of 550 individuals, representing 53 species of click beetles, were captured for this study. The number of species and the number of individuals were not significantly different among the three forest types. However, the composition of species in the three forest types was different. The 46 stands were divided into three groups that were approximately equivalent to the three forest types by Twinspan analysis. Elaterid species associated with the primary forest was Dalopius exilis Kishii. Selatosomus puerilis Kishii and Hemicrepideus secessus secessus Candeze were specific to the secondary forest, and Hemicrepidius sinuatus sinuatus (Lewis) and Ampedus optabilis optabilis (Lewis) showed their preference for the larch plantation. In environmental factors investigated, openness of the canopy influenced the number of the species.