We identified a half-shell like feature with a high emission line ratio of T(SiO J= 2- 1)/T(H~(13)CO~+J= 1 - 0)~6 - 8 and large velocity width in the Galactic Center 50 km s~(-1) molecular cloud, which is conspicuous in the Sgr A region and harbors an active star-forming site. These properties suggest that the feature is originated by a cloud-cloud collision. We analyzed the CS J= 1-0 emission line data obtained by Nobeyama Millimeter Array to explore the molecular cloud cores in the cloud. The core mass function in the feature has a flat slope and is not truncated up to~ 2000M_Θ. This may a sign of massive star formation induced by the cloud-cloud collision.
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