1. An image blur correcting apparatus comprising: a lens-barrel part including a lens and an imaging device; image signal processing means for forming a video signal from an electrical signal obtained at said imaging device; a supporting body for supporting said lens-barrel part in a freely pivoting manner around a rotating axis crossing a beam axis incident to said lens-barrel part at approximately right angles; actuator means, attached between said lens-barrel part and said supporting body, for rotating said lens-barrel part; relative angle detecting means for detecting a relative angle between said lens-barrel part and said supporting body; means for detecting a moving vector indicating an amount of blur of the image from correlation between two fields of image information from said image signal processing means, which are continuous in view of time; angular velocity operating means for calculating rotation angular velocity using a zoom multiplying factor from the detected moving vector; and calculating controlling means for outputting a control signal of an actuator in accordance with outputs of said relative angle detecting means and said angular velocity detecting means; wherein the amount of blur of the image is determined in both a pitch and yaw direction.