Various embodiments of the present invention relate to a microstrip-to-waveguide conversion structure for a wideband transition, and a technical problem to be solved is to provide a microstrip-to-waveguide conversion structure having a low conversion loss and a wide bandwidth. To this end, the present invention provides a dielectric layer comprising: a dielectric layer having a first planar surface and a second planar surface opposite to the first surface; A strip line formed on the first surface of the dielectric layer in a straight line shape; a first probe line formed on the first surface of the dielectric layer so as to extend obliquely to one side from one end of the strip line; A second probe line extending obliquely from one end of the microstrip to the other; A first coplanar waveguide formed on a first side of the dielectric layer and spaced from the microstrip; And a second coplanar waveguide formed on a second side of the dielectric layer. The microstrip-to-waveguide conversion structure for a wideband transition includes:
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