A high-frequency circuit package, comprising: a dielectric substrate including an edge area; a signal line formed on the dielectric substrate and extending from the edge area toward an inner area of the dielectric substrate; a first ground conductor layer and a second ground conductor layer formed on sides of the signal line and disposed at a distance from the signal line; a frame-shaped dielectric layer formed on the dielectric substrate to overlap parts of the signal line, the first ground conductor layer, and the second ground conductor layer and to expose the signal line, the first ground conductor layer, and the second ground conductor layer in the edge area; a third ground conductor layer formed on an upper surface of the frame-shaped dielectric layer; a first recess formed in a side surface of the frame-shaped dielectric layer above the signal line, the first ground conductor layer, and the second ground conductor layer, wherein a depth of the first recess increases with proximity to the signal line, and wherein the first recess includes: a first indented part having a central surface located above an area between the first ground conductor layer and second ground conductor layer, a second indented part having a first surface located above the first ground conductor layer, wherein the first surface extends laterally at an oblique angle with respect to a length direction of the signal line, and a third indented part having a second surface located above the second ground conductor layer, wherein the second surface extends laterally at an oblique angle with respect to the length direction of the signal line; a first ground line formed on the first surface of the second indented part and configured to electrically connect the first ground conductor layer with the third ground conductor layer; and a second ground line formed on the second surface of the third indented part and configured to electrically connect the second ground conductor layer with the third ground conductor layer. a dielectric substrate including an edge area; a signal line formed on the dielectric substrate and extending from the edge area toward an inner area of the dielectric substrate; a first ground conductor layer and a second ground conductor layer formed on sides of the signal line and disposed at a distance from the signal line; a frame-shaped dielectric layer formed on the dielectric substrate to overlap parts of the signal line, the first ground conductor layer, and the second ground conductor layer and to expose the signal line, the first ground conductor layer, and the second ground conductor layer in the edge area; a third ground conductor layer formed on an upper surface of the frame-shaped dielectric layer; a first recess formed in a side surface of the frame-shaped dielectric layer above the signal line, the first ground conductor layer, and the second ground conductor layer, wherein a depth of the first recess increases with proximity to the signal line, and wherein the first recess includes: a first indented part having a central surface located above an area between the first ground conductor layer and second ground conductor layer, a second indented part having a first surface located above the first ground conductor layer, wherein the first surface extends laterally at an oblique angle with respect to a length direction of the signal line, and a third indented part having a second surface located above the second ground conductor layer, wherein the second surface extends laterally at an oblique angle with respect to the length direction of the signal line; a first indented part having a central surface located above an area between the first ground conductor layer and second ground conductor layer, a second indented part having a first surface located above the first ground conductor layer, wherein the first surface extends laterally at an oblique angle with respect to a length direction of the signal line, and a third indented part having a second surface located above the second ground conductor layer, wherein the second surface extends laterally at an oblique angle with respect to the length direction of the signal line; a first ground line formed on the first surface of the second indented part and configured to electrically connect the first ground conductor layer with the third ground conductor layer; and a second ground line formed on the second surface of the third indented part and configured to electrically connect the second ground conductor layer with the third ground conductor layer.