An electrochemical cell comprising: an electrode group in which a positive electrode and a negative electrode are overlapped through a separator; a positive electrode container to which a positive electrode projecting portion of the positive electrode which projects from an overlapping portion with respect to the negative electrode is electrically connected; and a negative electrode container to which a negative electrode projecting portion of the negative electrode which projects from the overlapping portion is electrically connected as well as demarcating a housing space which houses the electrode group with the positive electrode container, wherein central axis lines of the positive electrode container and the negative electrode container are positioned on a common axis which is hereinafter referred to as the axis line, and the electrode group is configured by winding a laminate including a sheet-like positive electrode, a negative electrode and a separator (23, 100, 200) arranged on both sides of the negative electrode, which is housed inside the housing space in a state where a winding axis is coaxially arranged with the axis line, characterized in that: the positive and negative electrodes are shifted relative to one another along the direction of the axis line, whereby the positive electrode projecting portion is formed; and an end surface of the positive electrode projecting portion abuts a bottom wall portion of the positive electrode container through a first conductive material containing a carbon-based material. an electrode group in which a positive electrode and a negative electrode are overlapped through a separator; a positive electrode container to which a positive electrode projecting portion of the positive electrode which projects from an overlapping portion with respect to the negative electrode is electrically connected; and a negative electrode container to which a negative electrode projecting portion of the negative electrode which projects from the overlapping portion is electrically connected as well as demarcating a housing space which houses the electrode group with the positive electrode container, wherein central axis lines of the positive electrode container and the negative electrode container are positioned on a common axis which is hereinafter referred to as the axis line, and the electrode group is configured by winding a laminate including a sheet-like positive electrode, a negative electrode and a separator (23, 100, 200) arranged on both sides of the negative electrode, which is housed inside the housing space in a state where a winding axis is coaxially arranged with the axis line, characterized in that: the positive and negative electrodes are shifted relative to one another along the direction of the axis line, whereby the positive electrode projecting portion is formed; and an end surface of the positive electrode projecting portion abuts a bottom wall portion of the positive electrode container through a first conductive material containing a carbon-based material. the positive and negative electrodes are shifted relative to one another along the direction of the axis line, whereby the positive electrode projecting portion is formed; and an end surface of the positive electrode projecting portion abuts a bottom wall portion of the positive electrode container through a first conductive material containing a carbon-based material.