PURPOSE: To make the flight by the human power easier by fixing a flexible- wing type of left and right main wings to allow fluttering to the posts to which frames are connected through telescopic joints 10, and fluttering the both main wings through the operation of a pedal, so as to obtain a lift and a thrust.

CONSTITUTION: While two keels 2 and 2 are connected to a pair of the left and the right posts 1 and 1 extending longitudinally in the direction to cross the posts, the upper and the lower frames 3 and 4 are connected to the upper ends and the lower sides of the posts 1 and 1. And at the middle part of the posts 1 and 1, a main frame 5 is connected inclining at a specific angle to the posts 1 and 1. The keels 2 and 2 are crossed at the rear side in X-shape, and a tail wing 7 is composed at the rear side of the crossing part. And main wings 8A and 8B which are symmetric laterally are connected swayable to the posts 1 and 1 with the inner end sides of their leading edges 81 through telescopic joints 10, and the both main wings 8A and 8B are made to flutter through cords 15 by the operation of stepping a pedal 14.