A surface acoustic wave device includes a base portion that surrounds a surface acoustic wave element and is made of a resin, and a cap portion that is adhered onto the base portion so that a cavity sealing the surface acoustic wave element is formed, and is made of a resin. At least one of an adhering face of the base portion and an adhering face of the cap portion adhering the base portion and the cap portion is subjected to a grain finish or a dull finish. A convex portion is provided inside of the adhering face that is of one of the base portion and the cap portion adhered to the other.