An SAW device (1) has a piezoelectric substrate (3) propagating acoustic waves, and a comb-shaped electrode (6) arranged on a first surface (3a) of the piezoelectric substrate (3). The SAW device (1) has a columnar terminal (15) located on the first surface (3a) and electrically connected to the comb-shaped electrode (6), and a cover member (9) covering a side surface of the terminal (15). The terminal (15) comprises, in a first region in the direction of height thereof, a larger diameter on the side of the first surface (3a) compared with the diameter on the side opposite to the first surface (3a).