An inspection apparatus for an inspection target that is a layered structure including an fiber reinforced plastics material and/or a structure made of resin, the inspection apparatus comprising: a tapping device including a tapping tool for tapping an inspection target area on a surface of the inspection target, and an accelerometer mounted on the tapping tool and configured to detect an acceleration signal corresponding to acceleration of the tapping tool due to reaction force against the tapping; a recording unit configured to record waveform data about the acceleration signal detected by the accelerometer; a data processing unit configured to judge whether an internal defect is present in the inspection target, based on the waveform data; and a display unit configured to display a processing result obtained by the data processing unit, wherein the data processing unit is configured to create a contour map corresponding to the inspection target area based on the waveform data recorded in the recording unit, and to cause the display unit to display the contour map; the inspection apparatus further comprising: a frame for mounting the tapping device; a protrusion protruding from one side of the frame facing the surface of the inspection target; and a movement mechanism configured to be capable of changing an arrangement of the tapping device relative to the frame, wherein the movement mechanism includes: first rails extending in a first direction along the one side of the frame; a first slider movable along the first rail; a second rail that is attached to the first slider, extends along the one side, and extends in a second direction intersecting with the first direction; and a second slider that carries the tapping device and is movable along the second rail. a tapping device including a tapping tool for tapping an inspection target area on a surface of the inspection target, and an accelerometer mounted on the tapping tool and configured to detect an acceleration signal corresponding to acceleration of the tapping tool due to reaction force against the tapping; a recording unit configured to record waveform data about the acceleration signal detected by the accelerometer; a data processing unit configured to judge whether an internal defect is present in the inspection target, based on the waveform data; and a display unit configured to display a processing result obtained by the data processing unit, wherein the data processing unit is configured to create a contour map corresponding to the inspection target area based on the waveform data recorded in the recording unit, and to cause the display unit to display the contour map; the inspection apparatus further comprising: a frame for mounting the tapping device; a protrusion protruding from one side of the frame facing the surface of the inspection target; and a movement mechanism configured to be capable of changing an arrangement of the tapping device relative to the frame, wherein the movement mechanism includes: first rails extending in a first direction along the one side of the frame; a first slider movable along the first rail; a second rail that is attached to the first slider, extends along the one side, and extends in a second direction intersecting with the first direction; and a second slider that carries the tapping device and is movable along the second rail. a frame for mounting the tapping device; a protrusion protruding from one side of the frame facing the surface of the inspection target; and a movement mechanism configured to be capable of changing an arrangement of the tapping device relative to the frame, wherein the movement mechanism includes: first rails extending in a first direction along the one side of the frame; a first slider movable along the first rail; a second rail that is attached to the first slider, extends along the one side, and extends in a second direction intersecting with the first direction; and a second slider that carries the tapping device and is movable along the second rail. first rails extending in a first direction along the one side of the frame; a first slider movable along the first rail; a second rail that is attached to the first slider, extends along the one side, and extends in a second direction intersecting with the first direction; and a second slider that carries the tapping device and is movable along the second rail.