According to one embodiment, an inkjet head comprises a main body which is adhered onto a substrate with an adhesive layer. The substrate includes inflow parts that are opened to a mounting surface. Side surfaces of the main body, internal surfaces of the grooves, an end part of the adhesive layer, and the mounting surface are covered with a conductive layer. The conductive layer is provided with insulating patterns. The insulating patterns run between the grooves and extending to the mounting surface.