Rotary connector device and flat cable assembly for rotary connector device

The flat cable assembly (60) has a first lead block (61), a first flat cable (62), and a second flat cable (63). The first lead block (61) includes a first lead block main body (61A) and a first conductor (61B), the first conductor (61B) includes a first exposed surface (61C) exposed from the first lead block main body (61A), and the first conductor (61B) is attached to the first lead block main body (61A). The first flat cable (62) includes a first cable end portion (62A) connected to the first exposed surface (61C) so as to extend from the first exposed surface (61C) in the first direction (D21). The second flat cable (63) includes a second cable end portion (63A) connected to the first exposed surface (61C) so as to extend from the first exposed surface (61C) in a second direction (D22) different from the first direction (D21). 扁平线缆组装体(60)具有第1引线块(61)、第1扁平线缆(62)以及第2扁平线缆(63)。第1引线块(61)包含第1引线块主体(61A)和第1导电体(61B)，该第1导电体(61B)包含从第1引线块主体(61A)露出的第1露出面(61C)，并且该第1导电体(61B)安装于第1引线块主体(61A)。第1扁平线缆(62)包含第1线缆端部(62A)，该第1线缆端部