In-vehicle wireless communication (IVC) has recently attracted considerable attention in order to advance the amenity and entertaining. For the IVC, a high speed data transmission scheme is required because various applications such as wireless seat-monitor for high definition movie transmission are considered. In this paper, we focus on 60GHz wideband radio because it offers ultra-high speed communications, and we present measurement results of the in-vehicle 60GHz radio channel and the leakage power to outside vehicle and discuss. The measurements are conducted for various passenger's number and terminal locations. The relation between the number of multipath and the amount of received energy is also discussed in order to predict the performance of Rake combine.%近年，車内のエレクトロニクス化が進んでおり，環境性能や車内空間の快適性とエンターテイメント性向上のために車内無線通信の研究が活発に行われている．車内無線ではシートモニタへの高精細度動画伝送などが考えられており，高速無線通信の導入が期待されている．そこで本稿では，近距離超高速無線伝送で大きく注目されている60GHz 帯に着目し，その車内伝搬特性について実験的に検討している．実験では受信側端末に無指向性アンテナを想定し，端末の配置や乗客数の変化による周波数特性または伝搬遅延特性やRake合成を想定した場合の受信特性を明らかにし，さらに車内無線の車外への漏えいについても検討している．
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