also: とこを
particle, conjunction
although (it is a certain time or condition); even though normally
Used to express that an action occurs despite an unfavorable or unexpected time or situation. Often follows a noun or clause describing the circumstance.
お忙しいところを、わざわざお越しいただきありがとうございます。
Thank you for coming all this way despite being so busy.
雨が降っているところを、彼は出かけて行った。
He went out even though it was raining.