A tape cassette configured to accommodate a tape, comprising: a box-like cassette case having a first outer wall, a second outer wall, a third outer wall, a fourth outer wall, a fifth outer wall and a sixth outer wall, the first outer wall and the second outer wall extending in parallel and being arranged in a first direction perpendicular to both the first outer wall and the second outer wall, the third outer wall and the fourth outer wall extending in parallel and being arranged in a second direction perpendicular to both the third outer wall and the fourth outer wall, the fifth outer wall and the sixth outer wall extending in parallel and being arranged in a third direction perpendicular to both the fifth outer wall and the sixth outer wall, and the first direction, the second direction and the third direction are perpendicular to each other; a substrate having a first surface and a second surface opposite to the first surface, a storage being provided to the second surface and configured to store information regarding the tape cassette, wherein the third wall is formed with a first recess recessed in a fourth direction which is a one-way direction of the second direction directed from the third wall toward the fourth wall, the first recess having a bottom wall (71, 73) intersecting with the second direction, wherein the bottom wall is formed with one of a second recess recessed in the fourth direction and a hole penetrating through the bottom wall in the fourth direction, wherein the substrate is arranged in the first recess with the first surface facing a direction opposite to the fourth direction and with an adhesive layer being sandwiched between the bottom wall and the second surface, wherein one of the storage and a molded part protecting the storage is arranged in the one of the second recess and the hole, wherein the first recess is formed with an opening part (74, 75) at a particular position in the second direction, at least a part of the adhesive layer being accessible along the first direction through the opening part, and wherein the cassette case is provided with a blocking member (76, 176) overlapping the one of the storage and the molded part in the first direction at the particular position. a box-like cassette case having a first outer wall, a second outer wall, a third outer wall, a fourth outer wall, a fifth outer wall and a sixth outer wall, the first outer wall and the second outer wall extending in parallel and being arranged in a first direction perpendicular to both the first outer wall and the second outer wall, the third outer wall and the fourth outer wall extending in parallel and being arranged in a second direction perpendicular to both the third outer wall and the fourth outer wall, the fifth outer wall and the sixth outer wall extending in parallel and being arranged in a third direction perpendicular to both the fifth outer wall and the sixth outer wall, and the first direction, the second direction and the third direction are perpendicular to each other; the first outer wall and the second outer wall extending in parallel and being arranged in a first direction perpendicular to both the first outer wall and the second outer wall, the third outer wall and the fourth outer wall extending in parallel and being arranged in a second direction perpendicular to both the third outer wall and the fourth outer wall, the fifth outer wall and the sixth outer wall extending in parallel and being arranged in a third direction perpendicular to both the fifth outer wall and the sixth outer wall, and the first direction, the second direction and the third direction are perpendicular to each other; a substrate having a first surface and a second surface opposite to the first surface, a storage being provided to the second surface and configured to store information regarding the tape cassette, wherein the third wall is formed with a first recess recessed in a fourth direction which is a one-way direction of the second direction directed from the third wall toward the fourth wall, the first recess having a bottom wall (71, 73) intersecting with the second direction, wherein the bottom wall is formed with one of a second recess recessed in the fourth direction and a hole penetrating through the bottom wall in the fourth direction, wherein the substrate is arranged in the first recess with the first surface facing a direction opposite to the fourth direction and with an adhesive layer being sandwiched between the bottom wall and the second surface, wherein one of the storage and a molded part protecting the storage is arranged in the one of the second recess and the hole, wherein the first recess is formed with an opening part (74, 75) at a particular position in the second direction, at least a part of the adhesive layer being accessible along the first direction through the opening part, and wherein the cassette case is provided with a blocking member (76, 176) overlapping the one of the storage and the molded part in the first direction at the particular position.