A cutting tool comprising a substrate and a coating provided on the substrate, the coating comprising: a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer, wherein a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at% or more and 12 at% or less, and a content of nitrogen in the non-interface region is 0 at% or more and 0.15 at% or less; and the titanium compound layer comprises a multilayer structure layer adjacent to the first alumina layer, the multilayer structure layer is composed of a first unit layer and a second unit layer, the first unit layer and the second unit layer are alternately stacked in the multilayer structure layer, the first unit layer is made of titanium carbonitride, and the second unit layer is made of titanium carbonitroxide; wherein the content of nitrogen in the interface region and the content of nitrogen in the non-interface region are atomic ratios to the total of aluminum, oxygen, and nitrogen in the first alumina layer, determined by performing line analysis on a cross-sectioned sample parallel to the direction of the normal to the surface of the substrate by Auger electron spectroscopy; and wherein the interface region of the first alumina layer is a region sandwiched between an interface with the titanium compound layer and a virtual plane parallel to the interface that passes through a point 0.5 μm away from the interface in a thickness direction. the coating comprising: a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer, a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer, wherein a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at% or more and 12 at% or less, and a content of nitrogen in the non-interface region is 0 at% or more and 0.15 at% or less; and the titanium compound layer comprises a multilayer structure layer adjacent to the first alumina layer, the multilayer structure layer is composed of a first unit layer and a second unit layer, the first unit layer and the second unit layer are alternately stacked in the multilayer structure layer, the first unit layer is made of titanium carbonitride, and the second unit layer is made of titanium carbonitroxide; wherein the content of nitrogen in the interface region and the content of nitrogen in the non-interface region are atomic ratios to the total of aluminum, oxygen, and nitrogen in the first alumina layer, determined by performing line analysis on a cross-sectioned sample parallel to the direction of the normal to the surface of the substrate by Auger electron spectroscopy; and wherein the interface region of the first alumina layer is a region sandwiched between an interface with the titanium compound layer and a virtual plane parallel to the interface that passes through a point 0.5 μm away from the interface in a thickness direction. wherein the content of nitrogen in the interface region and the content of nitrogen in the non-interface region are atomic ratios to the total of aluminum, oxygen, and nitrogen in the first alumina layer, determined by performing line analysis on a cross-sectioned sample parallel to the direction of the normal to the surface of the substrate by Auger electron spectroscopy; and wherein the interface region of the first alumina layer is a region sandwiched between an interface with the titanium compound layer and a virtual plane parallel to the interface that passes through a point 0.5 μm away from the interface in a thickness direction.