Liquid ejection head and liquid ejection apparatus

A liquid ejection head comprising:

• a recording element substrate which ejects a liquid;
• an electric wiring substrate which is electrically connected to the recording element substrate;
• an electric substrate which has a plurality of electric components, which is electrically connected to the recording element substrate via the electric wiring substrate, and which is provided with a connection portion electrically connected to the electric wiring substrate;
• a wall which covers the electric substrate such that a liquid can be retained between the wall and the electric substrate;
• and
• a sensor which is disposed in an area covered by the wall and which detects for the presence of a liquid,
• wherein, in an attitude of the liquid ejection head as attached to a main unit of a liquid ejection apparatus, the sensor is disposed below the plurality of electric components and the connection portion in a vertical direction.

A liquid ejection head comprising:

• a recording element substrate which ejects a liquid;
• an electric wiring substrate which is electrically connected to the recording element substrate;
• an electric substrate which is electrically connected to the recording element substrate via the electric wiring substrate, and which is provided with a connection portion electrically connected to the electric wiring substrate;
• and
• a sensor which is provided on the electric substrate and which detects for the presence of a liquid,
• wherein, the sensor is disposed at a position near an edge of the electric substrate as compared with a position where the connection portion is disposed with respect to a direction in which the electric wiring substrate is elongated from the connection portion.