This study was conducted to evaluate the groundwater quality in sand dune area of northwest Honshu island, Japan. Three observation wells were installed with three plastic tubes to collect ground water of 2.0, 2.5 and 3.0 m depth. Groundwater samples were analyzed for EC, pH, DO, concentration of Fe, K and NO₃-N during the period of April, 2004 to March, 2005. Groundwater level and soil environment from 0.1 m through 3.0 m was also evaluated. The groundwater level of the study field was observed within a range of 114.43 to 169.33 cm below ground surface. The results showed that EC, pH, DO and K concentration in groundwater were decreased with increasing depth whereas the opposite trend was observed for Fe. The groundwater of the study area was found not to be suitable for irrigation since concentration of Fe was more than 5 mg L^-1. Average concentrations of NO₃-N in groundwater of the study area were 0.026 mg L^-1. Since concentration of NO₃-N was very low in groundwater, there would not be any threat to human health and environment.