Many straits are not sufficiently narrow to justify neglecting the effect of the Earth's rotation. In the present study, analytic solutions are derived for the internal waves generated by strong tide-sill interaction in a rotating channel, and the effect of the Earth's rotation on the internal wave generation is clarified. Solutions include the Poincar¿ waves with frequencies higher than the frequency of tidal forcing so that even when the forcing frequency is subinertial, there exist freely propagating Poincar¿ waves. The Kelvin waves as well as the Poincar¿ waves are generated. The amplitude of the Kelvin waves turns out to be much larger than that of the Poincar¿ waves so that most of the excited energy propagates away from the sill in the form of the Kelvin waves.