A variable valve timing control device (A), comprising: a drive-side rotational body rotating synchronously with a crankshaft of an internal combustion engine (E); a driven-side rotational body being coaxially disposed with a rotary axis (X) of the drive-side rotational body and rotating integrally with a camshaft for opening and closing a valve; a connecting bolt being coaxially disposed with the rotary axis (X) and connecting the driven-side rotational body to the camshaft , the connecting bolt being formed with an advanced-angle port and a retarded-angle port from an outer circumferential surface of the connecting bolt through an inner space , the advanced-angle port and the retarded-angle port communicating with an advanced-angle chamber (Ca) and a retarded-angle chamber (Cb), respectively, that are disposed between the drive-side rotational body and the driven-side rotational body ; a valve unit (Vb) being disposed at the inner space of the connecting bolt ; and a check valve (CV) being provided at an upstream in a supplying direction of fluid relative to the valve unit (Vb), characterized in that the check valve (CV) includes a seat member being formed with at least one circulation port at a position being away from the rotary axis (X); and a valve plate including a valve body being configured to close the circulation port at a downstream in the supplying direction of the fluid relative to the seat member , the valve body including an opening portion about the rotary axis (X), the valve body is formed in a circular shape about the rotary axis (X), the valve body is surrounded by an annular portion that is about the rotary axis (X), and the valve body and the annular portion are connected with each other by a spring portion . a drive-side rotational body rotating synchronously with a crankshaft of an internal combustion engine (E); a driven-side rotational body being coaxially disposed with a rotary axis (X) of the drive-side rotational body and rotating integrally with a camshaft for opening and closing a valve; a connecting bolt being coaxially disposed with the rotary axis (X) and connecting the driven-side rotational body to the camshaft , the connecting bolt being formed with an advanced-angle port and a retarded-angle port from an outer circumferential surface of the connecting bolt through an inner space , the advanced-angle port and the retarded-angle port communicating with an advanced-angle chamber (Ca) and a retarded-angle chamber (Cb), respectively, that are disposed between the drive-side rotational body and the driven-side rotational body ; a valve unit (Vb) being disposed at the inner space of the connecting bolt ; and a check valve (CV) being provided at an upstream in a supplying direction of fluid relative to the valve unit (Vb), characterized in that the check valve (CV) includes a seat member being formed with at least one circulation port at a position being away from the rotary axis (X); and a valve plate including a valve body being configured to close the circulation port at a downstream in the supplying direction of the fluid relative to the seat member , the valve body including an opening portion about the rotary axis (X), a seat member being formed with at least one circulation port at a position being away from the rotary axis (X); and a valve plate including a valve body being configured to close the circulation port at a downstream in the supplying direction of the fluid relative to the seat member , the valve body including an opening portion about the rotary axis (X), the valve body is formed in a circular shape about the rotary axis (X), the valve body is surrounded by an annular portion that is about the rotary axis (X), and the valve body and the annular portion are connected with each other by a spring portion . <EOS>