(currently amended) A drive mode switch control device for a vehicle configured to control switching of driving between a driver and an autonomous driving function, the vehicle including the autonomous driving function configured to replace a driving operation with the driver, the drive mode switch control device comprising: an operation information acquisition unit (64a, 180a) configured to acquire an operation information item associated with the driving operation input to at least one of a plurality of operation targets, the plurality of operation targets including at least an accelerator part, a brake part, and a steering part; a drive state switch unit configured to execute an override that switches from an autonomous driving state, in which the autonomous driving function controls a travel of the vehicle, to another driving state, in which the driving operation of the driver reflects on a behavior of the vehicle, in response to an input of the driving operation to at least one of the plurality of operation targets while the vehicle is in the autonomous driving state; an attitude determination unit configured to acquire a plurality of detection information items related to driving attitudes of the driver, and determine whether each of the plurality of detection information items is appropriate for the driving operation; and an approved target setting unit configured to set an approved operation target, for which the override is approved, or a disapproved operation target, for which the override is not approved, to each of the accelerator part, the brake part, and the steering part included in the plurality of operation targets based on whether each of the plurality of detection information items is appropriate for the driving operation. an operation information acquisition unit (64a, 180a) configured to acquire an operation information item associated with the driving operation input to at least one of a plurality of operation targets, the plurality of operation targets including at least an accelerator part, a brake part, and a steering part; a drive state switch unit configured to execute an override that switches from an autonomous driving state, in which the autonomous driving function controls a travel of the vehicle, to another driving state, in which the driving operation of the driver reflects on a behavior of the vehicle, in response to an input of the driving operation to at least one of the plurality of operation targets while the vehicle is in the autonomous driving state; an attitude determination unit configured to acquire a plurality of detection information items related to driving attitudes of the driver, and determine whether each of the plurality of detection information items is appropriate for the driving operation; and an approved target setting unit configured to set an approved operation target, for which the override is approved, or a disapproved operation target, for which the override is not approved, to each of the accelerator part, the brake part, and the steering part included in the plurality of operation targets based on whether each of the plurality of detection information items is appropriate for the driving operation.