PURPOSE: To obtain the control chart display device which can clearly display plural abnormal points on the same screen.

CONSTITUTION: The control chart display device 1 consists of an input means 10 for inputting control data D, an automatic abnormal point detecting means 11 which detects abnormal points of received control data, a color map table setting and altering means 13 which sets a color map table 4 according to the received control data and sequentially updates the table, and a control chart output means 12 which generates a control chart on the basis of a control data D and the abnormal points from the automatic abnormal point detecting means 11 and blinks the abnormal points on the basis of updated data from the color map table setting and altering means 13. Further, the control chart output means 12 blinks the abnormal points, detected by the automatic detecting means 11, by using data of a variable color part in the color map table 4 sequentially updated by the color map table setting and altering means 13.