A radar device comprising: a wave projecting part for projecting pulsed electromagnetic waves to a target object in a specified direction at specified time intervals; a wave receiving part (16, 17) for receiving reflected waves reflected by said target object in the direction of projection of said pulsed electromagnetic waves; a scanning part for varying the direction of said projected electromagnetic waves and said received reflected waves in horizontal and vertical directions respectively within a specified angular scan range; an intensity measuring part for measuring the intensity of said reflected waves received by said wave receiving part (16, 17); a distance measuring part for measuring the distance to said target object based on elapsed time from when said pulsed electromagnetic waves are projected until when said reflected waves are received, said distance measuring part being adapted to determine a maximum reflection point at which the intensity of said received reflected waves is the largest; a relative speed calculating part for calculating a relative speed of said target object based on said measured distance and said elapsed time; a calculating part for calculating a quantity of displacement between the vertical scan direction of said maximum reflection point and a vertical reference direction of said scan range; and a correcting part for correcting said calculated quantity of displacement by moving said scan range vertically; characterized in that said calculating part is adapted to obtain a quantity of a current correction by summing of, firstly, a product of a quantity of a current displacement currently calculated by said calculating part and a filter coefficient and, secondly, a product of a quantity of a previous displacement previously calculated by said calculating part and previously corrected by said correcting part and a difference of one minus said filter coefficient, said calculating part being adapted to set said filter coefficient to a value which is fixed if the relative speed calculated by said relative speed calculating part is smaller than a predetermined value, and to a value which increases by specified steps based firstly on a decrease in the distance to said maximum reflecting point measured by said distance measuring part and secondly on an increase in the relative speed, if the relative speed calculated by said relative speed calculating part is equal to or larger than the predetermined value; wherein the correcting part is adapted to correct said currently calculated quantity of displacement by moving said scan range vertically based on said quantity of the current correction obtained by said calculating part. a wave projecting part for projecting pulsed electromagnetic waves to a target object in a specified direction at specified time intervals; a wave receiving part (16, 17) for receiving reflected waves reflected by said target object in the direction of projection of said pulsed electromagnetic waves; a scanning part for varying the direction of said projected electromagnetic waves and said received reflected waves in horizontal and vertical directions respectively within a specified angular scan range; an intensity measuring part for measuring the intensity of said reflected waves received by said wave receiving part (16, 17); a distance measuring part for measuring the distance to said target object based on elapsed time from when said pulsed electromagnetic waves are projected until when said reflected waves are received, said distance measuring part being adapted to determine a maximum reflection point at which the intensity of said received reflected waves is the largest; a relative speed calculating part for calculating a relative speed of said target object based on said measured distance and said elapsed time; a calculating part for calculating a quantity of displacement between the vertical scan direction of said maximum reflection point and a vertical reference direction of said scan range; and a correcting part for correcting said calculated quantity of displacement by moving said scan range vertically;