Atomizing core, atomizer and aerosol generating device

The utility model discloses an atomizing core, atomizer and aerosol generating device, the atomizing core includes atomizing core casing, heating element and electrode subassembly, atomizing core casing forms first accommodation chamber, heating element is provided in the first accommodation chamber, the number of electrode subassembly is two, respectively configured at the both ends of atomizing core, the first accommodation chamber is provided with the first accommodation chamber, the second accommodation chamber is provided with the second accommodation chamber, and the first accommodation chamber is provided with the second accommodation chamber. Each electrode assembly comprises a positive electrode end and a negative electrode end, so that the heating piece can be electrically connected with a power source through the positive electrode ends and the negative electrode ends, the atomization core can be installed in the atomizer shell without distinguishing the front face and the back face, and double-sid