A control device for a hybrid vehicle, said hybrid vehicle including an internal combustion engine and an electric motor generating a vehicle driving force, a power storage device capable of being charged and discharged, a drive device driving said electric motor, and a voltage converter provided between said driving device and said power storage device, configured to allow boosting of an input voltage of said driving device to a level higher than a voltage of said power storage device, said control device comprising: a running mode control unit controlling switching of a running mode including a first mode (CD mode) in which said internal combustion engine is stopped and running using said electric motor alone is given priority, and a second mode (CS mode) in which said internal combustion engine is operated and a state of charge indicating a charging state of said power storage device is maintained at a predetermined target; and a voltage upper limit control unit modifying a voltage upper limit value (VHUL) indicating an upper limit of voltage boosted by said voltage converter based on said running mode and operation/stop of said internal combustion engine, wherein said voltage upper limit control unit takes a first upper limit value as said voltage upper limit value when said running mode is at said first mode and said internal combustion engine is operating, or when said running mode is at said second mode, and takes a second upper limit value lower than said first upper limit value as said voltage upper limit value when said running mode is at said first mode and said internal combustion engine is stopped; said control device further comprising: a discharge allowable power control unit increasing, when said running mode is at said first mode and said internal combustion engine is stopped, a discharge allowable power (Wout) indicating electric power that can be discharged from said power storage device, and not increasing the discharge allowable power when said running mode is at said first mode and said internal combustion engine is operating, or when said running mode is at said second mode. a running mode control unit controlling switching of a running mode including a first mode (CD mode) in which said internal combustion engine is stopped and running using said electric motor alone is given priority, and a second mode (CS mode) in which said internal combustion engine is operated and a state of charge indicating a charging state of said power storage device is maintained at a predetermined target; and a voltage upper limit control unit modifying a voltage upper limit value (VHUL) indicating an upper limit of voltage boosted by said voltage converter based on said running mode and operation/stop of said internal combustion engine, wherein said voltage upper limit control unit takes a first upper limit value as said voltage upper limit value when said running mode is at said first mode and said internal combustion engine is operating, or when said running mode is at said second mode, and takes a second upper limit value lower than said first upper limit value as said voltage upper limit value when said running mode is at said first mode and said internal combustion engine is stopped; said control device further comprising: a discharge allowable power control unit increasing, when said running mode is at said first mode and said internal combustion engine is stopped, a discharge allowable power (Wout) indicating electric power that can be discharged from said power storage device, and not increasing the discharge allowable power when said running mode is at said first mode and said internal combustion engine is operating, or when said running mode is at said second mode.