Bonded body and method for manufacturing the same

A method for manufacturing a bonded body in which a first surface of a first member to be welded and a second surface of a second member to be welded are bonded to each other by a resistance welding, the method comprising:

• forming a protrusion on the first surface of the first member;
• forming a spacer on the first surface of the first welded member, the spacer having an electrically insulating property;
• arranging the first member and the second member on top of another such that the second surface of the second member is in contact with the protrusion, the spacer is positioned between the first member and the second member, and a portion of the first surface of the first member outside of the spacer is exposed from the second member;
• and
• bonding the first member and the second member at the protrusion by melting the protrusion by causing an electric current in each of the first member and the second member, wherein
• the bonding includes placing a first electrode and a second electrode to contact with the first surface of the first member and a first surface of the second member, respectively, to cause the electric current in each of the first member and the second member, the first surface of the second member being opposite to the second surface of the second member.