In this paper, results of experimental measurement and numerical simulation of acoustic environment are shown for the music hall of Hakodate communication center. The reverberation time is measured with the method of Time Stretched Pulse (TSP) for between the center of stage and two different audience seats of the center and side of the audience floor. Using the ray tracing method with 3-D models of the music hall for empty seats and full seats, we investigate acoustic pressure distribution on the audience floor. More over we propose a method to improve the acoustic environment for the hall with diffusers of simple structure, and show that the proposed method is effective to equalize pressure distribution of the audience floor.%本論文では，函館市公民館の音楽ホールの実測と数値シミュレーションを行った.残響時間はステージの中央から観客席の中央と壁側へ，1kHzのsin波とTSP信号を用いて測定した.また、空席状態と満席状態の音楽ホールの3Dモデルにレイトレーシングの理論を用いることで，観客席の音圧分布を調べた.さらに，観客席の音圧分布を均一にするために単純な構造のデフユーザをホールに用いて，音響環境を改善するための方法を提案して，有効性を示す.
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