In the paper, I defend the claim that agent who caused unintentional loss should take responsibility for it. Such kind of responsibility is neither a result of being guilty, being moral responsible for the loss, nor is just the expression of one’s sensitivity to other people’s hurt, but it has proper objective reasons. Human being experiences unity of his agency both in intentional actions and in actions which result in unintended harm. Moral agent is not only autonomous author of the (...) action but also, through his corporeality, is somebody vulnerable to influence of accidental, unintended factors. In order to preserve personal integrity agent is obliged to admit the relation between his action and caused harm. Reasons to take responsibility for unintended results of action do not only relate to structure of human agency, but also relate to the structure of action itself and its relation to acting person. These issues are presented in two first paragraphs of the article. Characteristic features of obligation to take responsibility for unintended loss is presented in the last part of the article. Such responsibility is not a matter of voluntary agency, does not lie in the core of one’s agency but concerns what belong to “penumbra of agency.” Agent through act of his will makes himself responsible. Act of taking responsibility encompasses such behaviours like explanation, apology, help. (shrink)