Proposed is a blender, in which a main body operates when a closure of a container lid on a container body is detected. In the blender according to the present disclosure, when the closure of the container lid is detected, a voltage is transferred from a first inductive coil of the main body to a second inductive coil of the container body. By using the voltage transferred to the second inductive coil, a light emitting unit of the container body transmits a light signal to a light receiving unit of the main body, and the light signal has a predetermined signal pattern. When the light receiving unit receives the light signal of the signal pattern, the main body recognizes the closure of the container lid on the container body such that the main body operates.