Work equipment , comprising: a work equipment main body including a first travel unit , a first travel drive unit configured to drive the first travel unit , a first energy source configured to supply energy to the first travel drive unit , and a cutting blade device for mowing; and a grass container device including a second travel unit , a second travel drive unit configured to drive the second travel unit , a second energy source configured to supply energy to the second travel drive unit , and a grass receiving chamber configured to store mowed grass clippings from the cutting blade device , the grass container device being detachably connected to the work equipment main body and being configured to travel by itself in a detached state by using the second travel unit , characterized in that the grass container device further includes an undercarriage carrying the second travel unit , the second travel drive unit and the second energy source , a grass container provided on the undercarriage so as to be tiltable around a laterally extending tilting center line and forming the grass receiving chamber , a gate plate configured to open and close a grass discharge opening provided in the grass container , and a tilt drive unit configured to tilt the grass container around the tilting center line, and the gate plate is supported by the undercarriage at a lower end of the gate plate so as to be pivotable around a rotational center line extending laterally along a lower edge of the grass discharge opening such that the gate plate is configured to serve as a chute when opening the grass discharge opening , wherein the gate plate is pivotally provided on the undercarriage such that the rotational center line coincides with the tilting center line of the grass container . a work equipment main body including a first travel unit , a first travel drive unit configured to drive the first travel unit , a first energy source configured to supply energy to the first travel drive unit , and a cutting blade device for mowing; and a grass container device including a second travel unit , a second travel drive unit configured to drive the second travel unit , a second energy source configured to supply energy to the second travel drive unit , and a grass receiving chamber configured to store mowed grass clippings from the cutting blade device , the grass container device being detachably connected to the work equipment main body and being configured to travel by itself in a detached state by using the second travel unit , characterized in that the grass container device further includes an undercarriage carrying the second travel unit , the second travel drive unit and the second energy source , a grass container provided on the undercarriage so as to be tiltable around a laterally extending tilting center line and forming the grass receiving chamber , a gate plate configured to open and close a grass discharge opening provided in the grass container , and a tilt drive unit configured to tilt the grass container around the tilting center line, and the gate plate is supported by the undercarriage at a lower end of the gate plate so as to be pivotable around a rotational center line extending laterally along a lower edge of the grass discharge opening such that the gate plate is configured to serve as a chute when opening the grass discharge opening , wherein the gate plate is pivotally provided on the undercarriage such that the rotational center line coincides with the tilting center line of the grass container . <EOS>