The effect of aspect ratio (AR) on the aerodynamic characteristics of rectangular wings is investigated. Reynolds numbers considered are 7.6 × 10~4 and 5.2 × 10~4. Experimental results are compared with analytical ones obtained from Lamar's method. It is shown that the aspect ratio of wings affects the stall characteristics when AR < 2.0. The aspect ratio also has an effect on the lift slope if AR ≤ 1.5. Furthermore, maximum lift coefficients increase when AR ≤ 1.0. Comparisons show that the variations of aerodynamic characteristics are caused by tip vortices. It is also considered that the position of the center of pressure is varied with the angle of attack because of the effects of the laminar separation bubble and tip vortices on wing surfaces.%MAVや火星探査用無人航空機は，レイノルズ数Reが10~4から10~5程度の低レイノルズ数流れを飛行する．そのため，レイノルズ数の低い流れにおける翼特性の理解は，機体の開発や制御にとって大変重要である．また,機体の小型化や輸送の観点から，小型無人機にはアスペクト比ARが小さな翼が用いられることも多い.
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