An electric stringed musical instrument (10; 410), comprising: a body; and a pickup device (27; 127; 227; 427) which is mountable on the body and which is configured to convert vibrations of a plurality of strings of the musical instrument into electric signals, the pickup device (27; 127; 227; 427) comprising: at least one magnet each of which is disposed in the vicinity of one of the strings when the pickup device is mounted on the body; a coil wound around the at least one magnet; and a magnetic attaching member (40; 35-1) which is electrically connected to the coil such that an electrically conductive state is established between the magnetic attaching member (40; 35-1) and the coil, and a plate-like shaped attachment member (29; 429) provided on a surface of the body and which can be magnetized, wherein the magnetic attaching member (40; 35-1) of the pickup device (27; 127; 227; 427) is constituted by a magnet which is magnetically attachable to the plate-like shaped attachment member (29; 429) such that a position or an angle of the pickup device (27; 127; 227; 427) relative to the body while keeping the electrically conductive state can be adjusted by moving the pickup device (27; 127; 227; 427) along a surface of the plate-like shaped attachment member (29; 429), wherein the plate-like shaped attachment member (29; 429) is electrically connected to at least one electric component provided on the body such that an electrically conductive state is established between the plate-like shaped attachment member (29; 429) and the at least one electric component, and wherein the magnetic attaching member (40; 35-1) is configured such that an electrically conductive state can be established between the magnetic attaching member (40; 35-1) and the plate-like shaped attachment member (29; 429) when the magnetic attaching member (40; 35-1) is magnetically attached to the plate-like shaped attachment member (29; 429). a body; and a pickup device (27; 127; 227; 427) which is mountable on the body and which is configured to convert vibrations of a plurality of strings of the musical instrument into electric signals, the pickup device (27; 127; 227; 427) comprising: at least one magnet each of which is disposed in the vicinity of one of the strings when the pickup device is mounted on the body; a coil wound around the at least one magnet; and a magnetic attaching member (40; 35-1) which is electrically connected to the coil such that an electrically conductive state is established between the magnetic attaching member (40; 35-1) and the coil, and at least one magnet each of which is disposed in the vicinity of one of the strings when the pickup device is mounted on the body; a coil wound around the at least one magnet; and a magnetic attaching member (40; 35-1) which is electrically connected to the coil such that an electrically conductive state is established between the magnetic attaching member (40; 35-1) and the coil, and a plate-like shaped attachment member (29; 429) provided on a surface of the body and which can be magnetized, wherein the magnetic attaching member (40; 35-1) of the pickup device (27; 127; 227; 427) is constituted by a magnet which is magnetically attachable to the plate-like shaped attachment member (29; 429) such that a position or an angle of the pickup device (27; 127; 227; 427) relative to the body while keeping the electrically conductive state can be adjusted by moving the pickup device (27; 127; 227; 427) along a surface of the plate-like shaped attachment member (29; 429), wherein the plate-like shaped attachment member (29; 429) is electrically connected to at least one electric component provided on the body such that an electrically conductive state is established between the plate-like shaped attachment member (29; 429) and the at least one electric component, and wherein the magnetic attaching member (40; 35-1) is configured such that an electrically conductive state can be established between the magnetic attaching member (40; 35-1) and the plate-like shaped attachment member (29; 429) when the magnetic attaching member (40; 35-1) is magnetically attached to the plate-like shaped attachment member (29; 429).