To provide an electrode lamination device and an electrode lamination method which properly laminate an electrode bagged in a separator on other electrodes.

An electrode lamination device 100 includes: detection means 200 for detecting a position of a first electrode 24 for a bagged electrode 20 where the first electrode 24 is placed in a separator 40 formed into a bag shape; and lamination means 112, 122 for laminating the first electrode 24 on a second electrode 30 having a polarity different from the first electrode 24 based on the detected position of the first electrode 24.