A camshaft rotational detection structure is configured that can improve the
precision
with which the camshaft rotational angle is detected. The camshaft rotational detection
structure detects the rotational angle of a camshaft to which rotation is transmitted
from the crankshaft of an engine through a cam sprocket mechanism. The camshaft
rotational detection structure is provided with a cam thrust flange, a detection
target, and a sensor. The cam thrust flange is provided on the camshaft near the
end of the camshaft where the cam sprocket mechanism exists and serves to restrict
axial movement of the camshaft. The detection target is provided on the cam thrust
flange. The sensor is arranged facing opposite the detection target and is configured
to detect the rotational angle of the camshaft.
