Photoelectric-surface electron source

A photoelectric-surface electron source comprising:

• a substrate configured to receive light incident from a substrate light-receiving surface and emit the light from a substrate main surface on a side opposite to the substrate light-receiving surface;
• a photoelectric surface provided on the substrate main surface to receive the light to emit photoelectrons;
• and
• an extraction electrode fixed to the substrate main surface to extract the photoelectrons from the photoelectric surface,
• wherein the extraction electrode includes:
• an electrode part that is disposed to be separated from the photoelectric surface on the substrate main surface side and provided with holes through which the photoelectrons pass, and
• a frame part fixed to a region surrounding the photoelectric surface on the substrate main surface,
• wherein the frame part includes a frame bonding part fixed to the substrate main surface, and
• an inner wall surface of the frame part is inclined to widen from the electrode part side toward the frame bonding part.