A heart rehabilitation support apparatus for supporting functional recovery of a heart of a subject after a cardiovascular disease treatment by using an instrument configured to impart an arbitrary exercise load according to a pedaling motion of the subject in a seated state, the heart rehabilitation support apparatus comprising: a drive unit that imparts load torque as the exercise load upon rotation of a crank to which pedals to be pushed by the subject is attached in the instrument; a biological signal detection unit that detects a biological signal from lower limb parts of the subject; a cardiac condition detection unit that detects a heart rate and an electrocardiogram change of the subject; a voluntary control unit that performs voluntary control of the load torque of the drive unit so as to generate running torque and a rotational speed according to an intention of the subject on the basis of the biological signal detected by the biological signal detection unit; an autonomous control unit that performs autonomous control of the load torque of the drive unit so as to generate assisting power for the pedaling motion of the subject on the basis of a rotation angle of the crank; an arterial blood measurement unit that measures a pulse rate and a blood oxygen saturation degree of the subject; and an optimum torque adjustment unit that adjusts a hybrid ratio of the voluntary control by the voluntary control unit and the autonomous control by the autonomous control unit on the basis of detection and measurement results by the cardiac condition detection unit and the arterial blood measurement unit; wherein the voluntary control unit and the autonomous control unit are respectively configured to control the load torque of the drive unit so that the heart rate of the subject is always maintained within an appropriate range; wherein the heart rehabilitation support apparatus is configured to decrease a pedal rotation frequency at the same time as increasing the load torque of the drive unit when the subject's heart rate is about to exceed the appropriate range while the subject is performing the pedaling motion; and wherein the heart rehabilitation support apparatus is configured to increase a crank rotational frequency at the same time as decreasing the load torque of the drive unit when the subject's heart rate is about to fall below the appropriate range. a drive unit that imparts load torque as the exercise load upon rotation of a crank to which pedals to be pushed by the subject is attached in the instrument; a biological signal detection unit that detects a biological signal from lower limb parts of the subject; a cardiac condition detection unit that detects a heart rate and an electrocardiogram change of the subject; a voluntary control unit that performs voluntary control of the load torque of the drive unit so as to generate running torque and a rotational speed according to an intention of the subject on the basis of the biological signal detected by the biological signal detection unit; an autonomous control unit that performs autonomous control of the load torque of the drive unit so as to generate assisting power for the pedaling motion of the subject on the basis of a rotation angle of the crank; an arterial blood measurement unit that measures a pulse rate and a blood oxygen saturation degree of the subject; and an optimum torque adjustment unit that adjusts a hybrid ratio of the voluntary control by the voluntary control unit and the autonomous control by the autonomous control unit on the basis of detection and measurement results by the cardiac condition detection unit and the arterial blood measurement unit; wherein the voluntary control unit and the autonomous control unit are respectively configured to control the load torque of the drive unit so that the heart rate of the subject is always maintained within an appropriate range; wherein the heart rehabilitation support apparatus is configured to decrease a pedal rotation frequency at the same time as increasing the load torque of the drive unit when the subject's heart rate is about to exceed the appropriate range while the subject is performing the pedaling motion; and wherein the heart rehabilitation support apparatus is configured to increase a crank rotational frequency at the same time as decreasing the load torque of the drive unit when the subject's heart rate is about to fall below the appropriate range.