Disclosed is a wing structure (1) which comprises a main wing (2) that extends in a second direction intersecting with a first direction serving as a direction along which fluid flows and an auxiliary wing (3) that is separated from the main wing (2) and that faces the main wing (2) at a position adjacent to the front portion of the main wing (2). The chord length of the auxiliary wing (3) is shorter than that of the main wing (2). The fluid hits the auxiliary wing (3) formed at the position adjacent to the front portion of the main wing (2), is guided to a space between the auxiliary wing (3) and the main wing (2), and is compressed while passing between the auxiliary wing (3) and the main wing (2). With this, a region of fluid compression process can be preferably formed on a surface of the main wing (2), resulting in an increase in acting force.