To surely prevent the locked condition of a power transmission passage.

When all shift positions SP of a shift actuator ACT in a passage, which are pre-shifted with a shift position sensor 60 for detecting a shift position, are determined to be in a neutral condition and executed to be pre-shifted, if a rotating speed difference between a target input shaft rotating speed Nin* of an input shaft on the pre-shifted side and an actual input shaft rotating speed Nin is a threshold value Nref or greater (Steps S106, S108), the input shaft on the pre-shifted side is determined to be into a locked condition to stopped pre-shift (Step S110). So, even when all shift positions SP of the shift actuator ACT in the passage, which are pre-shifted with the shift position sensor 60 in failure, are determined in error to be in the neutral condition N and executed to be pre-shifted, the locked condition of the input shaft on the pre-shifted side is surely prevented.

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