The cardiomyocyte contracts for the calcium ion concentration changing by action potential. The contractile force of the cardiomyocyte can be calculated with a cell function simulator that had made by Kyoto University. We constructed the left ventricular motion model with the use of this contractile force. And we calculate the displacement of the left ventricle. Then, we calculate the blood flow from the left ventricle to the aorta using this model by fluid-structure interaction. As a result, the blood flow was able to be calculated from the left ventricle, and the flux tendency was able to be obtained. But, it is necessary to improve the heart valve model.