Ignition coil for internal combustion engine

An ignition coil for internal combustion engine comprising:

• a cylinder portion disposed in a plug hole of the internal combustion engine by insertion;
• a head portion connected to the cylinder portion and disposed outside of the plug hole;
• and
• a sealing member disposed outside the cylinder portion in a radial direction and under the upper head portion for preventing water from infiltrating into the plug hole from an opening of the plug hole;
• wherein, a pillar portion that forms a part of a ventilation passage that communicates inside and outside of the plug hole via the sealing member and a cover portion that covers the pillar portion without blockading an upper opening of a ventilation opening of the pillar portion are formed on a side of the head portion,
• the cover portion has:
• a surrounding wall portion that covers an upper side and surroundings of the pillar portion;
• a bottom wall portion that closes a lower side of the surrounding wall portion;
• a water collecting chamber, which is a space formed by enclosing the surrounding wall portion and the bottom wall portion, that temporarily accommodate the water infiltrated from the outside of the upper head portion;
• and
• a communication hole formed in the bottom wall portion to drain the water accommodated in the water collecting chamber, and to communicate between the water collecting chamber and the outside of the plug hole,
• a lower edge surface of the bottom wall portion is located above a lower edge surface of the surrounding wall portion.