A control device (78; 190) of a four-wheel-drive vehicle having an electronic control coupling (92L, 92R) changing a transmission torque (T1, T2) transmitted from an input-side rotating member (94L, 94R) to an output-side rotating member (98L, 98R) depending on a supplied drive current (13,14), and a connecting/disconnecting mechanism connecting/disconnecting a power input to the input-side rotating member of the electronic control coupling through an operation of an electromagnetic actuator applying a braking torque (Ts) to the input-side rotating member (94L, 94R) of the electronic control coupling (92L, 92R), characterised in that the control device (78; 190) comprises: a storage portion (180a, 182a) configured to store a first relationship between the drive current supplied to the electronic control coupling (92L, 92R) and the transmission torque of the electronic control coupling (92L, 92R); a control portion (180, 182) configured to control the drive current supplied to the electronic control coupling (92L, 92R) based on the first relationship; and a learning portion (180b, 182b) configured to perform a correction for the first relationship through learning by applying the braking torque (Ts1; Ts2) to the input-side rotating member (94L, 94R) by the electromagnetic actuator, wherein the learning portion (180b, 182b) performs the correction for the first relationship stored in the storage portion by using the drive current (I3c, I4c) supplied to the electronic control coupling (92L, 92R) and the braking torque (Ts1; Ts2) at the time of determination that the transmission torque is balanced with the braking torque (Ts1; Ts2) based on a rotational speed (Np; Ncl, Ncr) of the input-side rotating member (94L, 94R) and a rotational speed (Nwrl, Nwrr) of the output-side rotating member (98L, 98R) while the rotational speed of the input-side rotating member (94L, 94R) is increased by the control portion (180, 182). a storage portion (180a, 182a) configured to store a first relationship between the drive current supplied to the electronic control coupling (92L, 92R) and the transmission torque of the electronic control coupling (92L, 92R); a control portion (180, 182) configured to control the drive current supplied to the electronic control coupling (92L, 92R) based on the first relationship; and a learning portion (180b, 182b) configured to perform a correction for the first relationship through learning by applying the braking torque (Ts1; Ts2) to the input-side rotating member (94L, 94R) by the electromagnetic actuator, wherein the learning portion (180b, 182b) performs the correction for the first relationship stored in the storage portion by using the drive current (I3c, I4c) supplied to the electronic control coupling (92L, 92R) and the braking torque (Ts1; Ts2) at the time of determination that the transmission torque is balanced with the braking torque (Ts1; Ts2) based on a rotational speed (Np; Ncl, Ncr) of the input-side rotating member (94L, 94R) and a rotational speed (Nwrl, Nwrr) of the output-side rotating member (98L, 98R) while the rotational speed of the input-side rotating member (94L, 94R) is increased by the control portion (180, 182).