An apparatus for manufacturing an electrode assembly, which is configured to laminate a stack of an electrode and a separator to manufacture an electrode assembly, the apparatus comprises: an upper roll and a lower roll, which are configured to press upper and lower portions of the stack, respectively; an upper support part configured to support the upper roll; a moving part configured to allow the upper support part to move; a lower support part configured to support both sides of the lower roll; a pressure detection part provided on the lower support part to measure a pressure applied to the lower roll, thereby detecting a pressure applied to the stack; and a control part configured to adjust the pressure applied to the stack by reflecting a pressure detection value detected in the pressure detection part, wherein the pressure detection part comprises a first pressure detection part configured to detect a pressure applied to one side of the lower roll; and a second pressure detection part configured to detect a pressure applied to the other side of the lower roll; wherein the lower support part comprises a first support part configured to support the one side of the lower roll and a second support part configured to support the other side of the lower roll, and the first pressure detection part detects a pressure applied to the first support part, and the second pressure detection part detects a pressure applied to the second support part; and wherein the lower support part further comprises a third support part configured to support lower portions of the first support part and the second support part, and the pressure detection part further comprises a third pressure detection part configured to extract the total pressure applied to the stack by detecting a pressure applied to the third support part. an upper roll and a lower roll, which are configured to press upper and lower portions of the stack, respectively; an upper support part configured to support the upper roll; a moving part configured to allow the upper support part to move; a lower support part configured to support both sides of the lower roll; a pressure detection part provided on the lower support part to measure a pressure applied to the lower roll, thereby detecting a pressure applied to the stack; and a control part configured to adjust the pressure applied to the stack by reflecting a pressure detection value detected in the pressure detection part, wherein the pressure detection part comprises a first pressure detection part configured to detect a pressure applied to one side of the lower roll; and a second pressure detection part configured to detect a pressure applied to the other side of the lower roll; wherein the lower support part comprises a first support part configured to support the one side of the lower roll and a second support part configured to support the other side of the lower roll, and the first pressure detection part detects a pressure applied to the first support part, and the second pressure detection part detects a pressure applied to the second support part; and wherein the lower support part further comprises a third support part configured to support lower portions of the first support part and the second support part, and the pressure detection part further comprises a third pressure detection part configured to extract the total pressure applied to the stack by detecting a pressure applied to the third support part.