Discharge device

A discharge device comprising:

• a discharge electrode including a distal end portion;
• a counter electrode disposed so as to face the distal end portion of the discharge electrode with a gap provided between the counter electrode and the distal end portion;
• and
• a voltage application device that applies a voltage between the discharge electrode and the counter electrode to generate a discharge between the discharge electrode and the counter electrode,
• wherein
• the discharge electrode protrudes toward the counter electrode,
• the counter electrode includes a discharge portion in which the discharge occurs between the discharge portion and the distal end portion of the discharge electrode,
• the discharge portion extends along a circumference centered at the distal end portion of the discharge electrode,
• the counter electrode further includes a tubular portion extending in a direction in which the discharge electrode protrudes,
• the tubular portion includes a first opening and a second opening arranged in a direction in which the discharge electrode protrudes,
• the first opening is disposed closer to the discharge electrode than the second opening is,
• the discharge portion is disposed at an edge of the first opening,
• the tubular portion further includes at least one step having an annular shape disposed between the first opening and the second opening on an inner periphery of the tubular portion,
• the discharge portion is one of a plurality of discharge portions, and
• at least one of the plurality of discharge portions is disposed in the at least one step.