It has a porous structure including a plurality of pores, and has a water vapor transmission rate of 2,000 g / m 2 · 24 h to 3,500 g / m 2 · 24 h under the conditions of 24 ° C. and 25% RH, and the porosity is An acrylic pressure-sensitive adhesive sheet that is 10% to 60% and a medical pressure-sensitive adhesive tape including the same are provided.複数の気孔を含む多孔性構造からなり、24℃及び25%RHの条件で透湿度(Water vapor transmission rate)が2,000g/m2・24h~3,500g/m2・24hであり、気孔率が10%~60%であるアクリル系粘着シート、及びそれを含む医療用粘着テープを提供する。