To provide a display device precisely measuring a leak current and an inspection device.

A liquid crystal panel 1 includes: a gate dummy pixel 14Dg and a source dummy pixel 14Ds arranged on the outer peripheral side of a display area 2; a test switch line 31 connected to dummy TFTs 13Dg and 13Ds of the gate dummy pixel 14Dg and the source dummy pixel 14Ds to switch their conduction states; a test gate line 32 connected to a dummy pixel electrode 12Dg, which is arranged in gate lines G not adjacent to each other among a plurality of gate lines G, to divide the gate lines G into two or more phases; a test source line 33 connected to a dummy pixel electrode 12Ds, which is arranged in source lines S not adjacent to each other among a plurality of source lines S, to divide the source lines S into two or more phases; and a test common electrode line 35 connecting the test gate line 32, the test source line 33, and the test switch line 31 mutually.