Layered heat exchanger, heat medium heating apparatus and vehicle air-conditioning apparatus using the same

A layered heat exchanger comprising:

• a flat heat exchanger tube configured by bonding two molded plates in which an inlet header section and an outlet header section are provided on both ends of a flat tube section through which a heat medium is flowed;
• and
• a heat exchanger pressing member that presses and makes closely attach to one another the plurality sets of flat heat exchanger tubes layered so that the inlet header section and the outlet header section are communicated with each other through communication holes, wherein
• at least one of an input position of a pressing force by the heat exchanger pressing member, a position where the pressing force is transmitted to a bonding portion of the two molded plates, and a position where the pressing force is transmitted to a sealing portion between the inlet header sections and/or between the outlet header sections is set as a position deviated from a same line in a pressing force direction with respect to the inlet header section and the outlet header section.