A shower head comprising: a head main body provided with a gas-liquid mixing portion, the gas-liquid mixing portion being disposed at an upstream side of an introducing path for warm or cold water which is formed in the head main body and mixing a gas absorbed by pressure reduction during introducing the warm or cold water in the warm or cold water as a bubble, a spray plate having a flat portion and a plurality of spray apertures formed at the flat portion by piercing in a thickness direction of the flat portion, the spray plate being disposed at an outside of an exit of the introducing path and attached to the head main body, and a discharge path formed between the head main body and the spray plate, disposed parallel to the spray plate, and communicated with the introducing path, characterized in that the gas-liquid mixing portion has a compression portion and a decompression portion at a second introducing path, the warm or cold water introduced in the second introducing path of the gas-liquid mixing portion is once pressurized when passing the compression portion and the pressure of the warm or cold water is subsequently reduced when passing the decompression portion, accompanied by the pressure reduction, a gas is absorbed in a gas path of a gas-introducing pipe through an entrance, the absorbed gas is mixed as a bubble in the warm or cold water introduced in the second introducing path through a communication path from an exit, the introducing path has an enlarged path at a side of the exit of the introducing path, a cross-sectional area of the enlarged path continuously enlarging toward the exit, and that the discharge path is disposed perpendicular to the side of the exit of the introducing path and an entrance of the discharge path has a cross-sectional area at which a volume of the warm or cold water flowing into the discharge path per unit time is equal to or less than a volume of the warm or cold water passing a portion except the enlarged path of the introducing path per unit time or less. a head main body provided with a gas-liquid mixing portion, the gas-liquid mixing portion being disposed at an upstream side of an introducing path for warm or cold water which is formed in the head main body and mixing a gas absorbed by pressure reduction during introducing the warm or cold water in the warm or cold water as a bubble, a spray plate having a flat portion and a plurality of spray apertures formed at the flat portion by piercing in a thickness direction of the flat portion, the spray plate being disposed at an outside of an exit of the introducing path and attached to the head main body, and a discharge path formed between the head main body and the spray plate, disposed parallel to the spray plate, and communicated with the introducing path, characterized in that the gas-liquid mixing portion has a compression portion and a decompression portion at a second introducing path, the warm or cold water introduced in the second introducing path of the gas-liquid mixing portion is once pressurized when passing the compression portion and the pressure of the warm or cold water is subsequently reduced when passing the decompression portion, accompanied by the pressure reduction, a gas is absorbed in a gas path of a gas-introducing pipe through an entrance, the absorbed gas is mixed as a bubble in the warm or cold water introduced in the second introducing path through a communication path from an exit, the introducing path has an enlarged path at a side of the exit of the introducing path, a cross-sectional area of the enlarged path continuously enlarging toward the exit, and that the discharge path is disposed perpendicular to the side of the exit of the introducing path and an entrance of the discharge path has a cross-sectional area at which a volume of the warm or cold water flowing into the discharge path per unit time is equal to or less than a volume of the warm or cold water passing a portion except the enlarged path of the introducing path per unit time or less.