TRANSMISSION CONTROL DEVICE

In a transmission comprising a driving force source, an oil pressure source that generates oil pressure using a driving force from the driving force source, a first power transmission unit having a first mechanical biasing mechanism, and a second power transmission unit having a second mechanical biasing mechanism, opening/closing unit is provided in an oil passage through which the oil pressure is supplied to the second power transmission unit in order to close the oil passage until the oil pressure supplied to the first power transmission unit reaches or exceeds a predetermined value.