Provided is an electrochemical device, wherein the capacity to be obtained per current collector is great, the internal resistance is small, and the assembling of the device is easy. A plurality of laminated bodies (16) is obtained; by preparing a laminated sheet body (16S) by inserting, in regard to a plurality of positive electrodes (11A) arranged to be mutually separated in the width direction, negative-electrode continuous members (11BW) between two mutually adjacent first current collectors (12a) that have two main units (12a1) of the first current collectors connected, and between two mutually adjacent first current collectors (12a) that have two first tab sections (12a2) connected, so as to be installed between each of the collectors; and by cutting the laminated sheet body, negative-electrode continuous member with the width of a unit device.