Strain detection element, pressure sensor, microphone, blood pressure sensor, and touch panel

A strain detection element configured to be fixed to a membrane being deformable, the strain detection element comprising:

• a metal layer including;
• a first magnetic layer;
• a second magnetic layer provided between the metal layer and the first magnetic layer;
• and
• an intermediate layer provided between the first magnetic layer and the second magnetic layer,
• an electrical resistance of the strain detection element being configured to change in accordance with a strain of the membrane,
• the metal layer including a first face on a side of the second magnetic layer,
• the intermediate layer including a second face on a side of the first magnetic layer, and
• the second face being flatter than the first face.

A strain detection element configured to be fixed to a membrane being deformable, the strain detection element comprising:

• a metal layer including;
• a first magnetic layer;
• a second magnetic layer provided between the metal layer and the first magnetic layer;
• and
• an intermediate layer provided between the first magnetic layer and the second magnetic layer,
• an electrical resistance of the strain detection element being configured to change in accordance with a strain of the membrane,
• the metal layer having a first grain size,
• the second magnetic layer having a second grain size smaller than the first grain size.