A vehicle comprising a control apparatus for a power transmission system, the vehicle including a driving force source, a drive wheel, an engagement device and an operating member, the engagement device being configured to connect or interrupt a power transmission path between the driving force source and the drive wheel, the control apparatus characterized by comprising an electronic control unit configured to: execute control for engaging the engagement device when the operating member is in a drive operating position; execute control for releasing the engagement device when the operating member is in a non-drive operating position; start engagement transition control for outputting an engagement transitional hydraulic pressure command value that causes the engagement device to be actuated from a released state toward an engaged state at a start point at which the operating member has been displaced from the non-drive operating position; determine whether an engagement transition time from when the engagement transition control is started to when the engagement device begins to develop a predetermined torque capacity is longer or shorter than a predetermined target time; when the engagement transition time is longer than the predetermined target time, learn the engagement transitional hydraulic pressure command value that is used in next engagement transition control such that the engagement transitional hydraulic pressure command value increases; when the engagement transition time is shorter than the predetermined target time, learn the engagement transitional hydraulic pressure command value that is used in the next engagement transition control such that the engagement transitional hydraulic pressure command value reduces; and determine whether an operating time from when the operating member has been displaced from the non-drive operating position to when the operating member has been shifted into the drive operating position is longer than a predetermined operating time; characterized in that the electronic control unit is configured to, when the operating time is longer than the predetermined operating time, prohibit learning of the engagement transitional hydraulic pressure command value or invalidate the learned engagement transitional hydraulic pressure command value. execute control for engaging the engagement device when the operating member is in a drive operating position; execute control for releasing the engagement device when the operating member is in a non-drive operating position; start engagement transition control for outputting an engagement transitional hydraulic pressure command value that causes the engagement device to be actuated from a released state toward an engaged state at a start point at which the operating member has been displaced from the non-drive operating position; determine whether an engagement transition time from when the engagement transition control is started to when the engagement device begins to develop a predetermined torque capacity is longer or shorter than a predetermined target time; when the engagement transition time is longer than the predetermined target time, learn the engagement transitional hydraulic pressure command value that is used in next engagement transition control such that the engagement transitional hydraulic pressure command value increases; when the engagement transition time is shorter than the predetermined target time, learn the engagement transitional hydraulic pressure command value that is used in the next engagement transition control such that the engagement transitional hydraulic pressure command value reduces; and determine whether an operating time from when the operating member has been displaced from the non-drive operating position to when the operating member has been shifted into the drive operating position is longer than a predetermined operating time; characterized in that the electronic control unit is configured to, when the operating time is longer than the predetermined operating time, prohibit learning of the engagement transitional hydraulic pressure command value or invalidate the learned engagement transitional hydraulic pressure command value.