Active matrix substrate and method for manufacturing same

An active matrix substrate having a pixel region, the active matrix substrate comprising:

• a terminal part connected to the pixel region;
• a guard ring provided around the terminal part;
• and
• a connection part that connect the terminal part and the guard ring to each other,
• wherein the pixel region, the terminal part, and the guard ring each include
• a first conductive layer in which at least a first metal film and a second metal film that is lower in resistance than the first metal film are stacked,
• a first protective layer disposed to overlap at least a part of the first conductive layer, and
• a second protective layer disposed over the first protective layer,
• the pixel region further includes a second conductive layer provided at a higher level than the first protective layer,
• the connection part includes
• the first metal film, and
• the second protective layer disposed over the first metal film,
• ends of the first conductive layer in the terminal part and the guard ring that face the connection part are located on an inside of ends of the first protective layer that face the connection part, and
• the second conductive layer and the second metal film contain materials that are etchable with an identical etchant.