An inflatable kite includes a main tube and a sub tube. The inflatable kite includes: a first air chamber, which constitutes the sub tube; a second air chamber, which constitutes the sub tube and which is disposed at a position that is farther from the main tube than from the first air chamber in the sub tube; and a pressure regulator configured to adjust a pressure of the first air chamber and a pressure of the second air chamber. The sub tube cut by one plane that crosses in the direction of extension of the sub tube has a maximal cross-sectional area on a cross section of the first air chamber. The pressure regulator regulates the pressure of the first air chamber to be lower than the pressure of the second air chamber in a steady flight of the inflatable kite.