A first antenna element is formed by a press-fitting first member and a second member to each other, and a second antenna element is formed by press-fitting a first member and a second member to each other. Respective members are fixed to a base by riveting, thereby achieving the antenna. This structure allows determining arbitrarily splitting positions and shapes of members of the first antenna element and the members of the second antenna element. The antenna can be obtained at an inexpensive cost even if an external appearance of the antenna is specified to be an irregular shape.